diff --git a/Dockerfile b/Dockerfile
index 06e9de9..889371d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -16,17 +16,20 @@ RUN wget https://github.com/Kitware/CMake/releases/download/v3.24.0/cmake-3.24.0
     && mkdir /opt/cmake \
     && /tmp/cmake-install.sh --skip-license --prefix=/opt/cmake \
     && rm /tmp/cmake-install.sh
-ENV PATH /opt/cmake/bin:${PATH}
+ENV PATH=/opt/cmake/bin:${PATH}
 
 RUN curl -L "https://repo.anaconda.com/miniconda/Miniconda3-latest-Linux-x86_64.sh" \
     -o "/tmp/Miniconda3.sh"
 RUN bash /tmp/Miniconda3.sh -b -p /opt/anaconda
 RUN rm -rf /tmp/Miniconda3.sh
 RUN cd /opt && eval "$(/opt/anaconda/bin/conda shell.bash hook)"
-ENV PATH /opt/anaconda/bin:${PATH}
-ENV LD_LIBRARY_PATH /opt/anaconda/lib:${LD_LIBRARY_PATH}
+ENV PATH=/opt/anaconda/bin:${PATH}
+ENV LD_LIBRARY_PATH=/opt/anaconda/lib:${LD_LIBRARY_PATH}
 
 # python prereqs
+RUN conda tos accept --override-channels --channel conda-forge
+RUN conda tos accept --override-channels --channel https://repo.anaconda.com/pkgs/main
+RUN conda tos accept --override-channels --channel https://repo.anaconda.com/pkgs/r
 RUN conda install -c conda-forge git
 RUN pip install numpy>=2.0.0
 RUN pip install scipy>=1.13.0 cython nibabel dipy tqdm
diff --git a/cuslines/cudamacro.h b/cuslines/cudamacro.h
index 49ac24c..7f03c6c 100644
--- a/cuslines/cudamacro.h
+++ b/cuslines/cudamacro.h
@@ -45,6 +45,18 @@
         exit(EXIT_FAILURE);                                                  \
     }}
 
+#if CUDART_VERSION >= 13000
+#define CUDA_MEM_ADVISE(devPtr, count, advice, device)            \
+    cudaMemLocation loc;                                          \
+    loc.type = cudaMemLocationTypeDevice;                         \
+    loc.id   = (device);                                          \
+    CHECK_CUDA(cudaMemAdvise((devPtr), (count), (advice), loc));
+#else
+#define CUDA_MEM_ADVISE(devPtr, count, advice, device)            \
+    CHECK_CUDA(cudaMemAdvise((devPtr), (count), (advice), (device)))
+#endif
+
+
 #ifdef USE_NVTX
 #include "nvToolsExt.h"
 
diff --git a/cuslines/cuslines.cpp b/cuslines/cuslines.cpp
index 4e8bc30..1363705 100644
--- a/cuslines/cuslines.cpp
+++ b/cuslines/cuslines.cpp
@@ -148,7 +148,7 @@ class GPUTracker {
       for (int n = 0; n < ngpus_; ++n) {
         CHECK_CUDA(cudaSetDevice(n));
         CHECK_CUDA(cudaMallocManaged(&dataf_d[n], sizeof(*dataf_d[n]) * dataf_info.size));
-        CHECK_CUDA(cudaMemAdvise(dataf_d[n], sizeof(*dataf_d[n]) * dataf_info.size, cudaMemAdviseSetPreferredLocation, n));
+        CUDA_MEM_ADVISE(dataf_d[n], sizeof(*dataf_d[n]) * dataf_info.size, cudaMemAdviseSetPreferredLocation, n);
         CHECK_CUDA(cudaMalloc(&H_d[n], sizeof(*H_d[n]) * H_info.size));
         CHECK_CUDA(cudaMalloc(&R_d[n], sizeof(*R_d[n]) * R_info.size));
         CHECK_CUDA(cudaMalloc(&delta_b_d[n], sizeof(*delta_b_d[n]) * delta_b_info.size));
diff --git a/cuslines/ptt.cu b/cuslines/ptt.cu
index b36e747..7bb0763 100644
--- a/cuslines/ptt.cu
+++ b/cuslines/ptt.cu
@@ -213,7 +213,7 @@ __device__ int get_direction_ptt_d(
     REAL_T *__first_val_sh = first_val_sh + tidy;
 
     const REAL_T max_curvature = SIN(max_angle / 2) / step_size; // bigger numbers means wiggle more
-    const REAL_T probe_step_size = ((step_size / 2) / (PROBE_QUALITY - 1));
+    const REAL_T probe_step_size = ((step_size / PROBE_FRAC) / (PROBE_QUALITY - 1));
 
     REAL_T __tmp;
 
diff --git a/cuslines/ptt.cuh b/cuslines/ptt.cuh
index d8986b5..e3317ff 100644
--- a/cuslines/ptt.cuh
+++ b/cuslines/ptt.cuh
@@ -6,16 +6,16 @@
 
 #define STEP_FRAC 20 // divides output step size (usually 0.5) into this many internal steps
 #define PROBE_FRAC 2 // divides output step size (usually 0.5) to find probe length
-#define PROBE_QUALITY 4
+#define PROBE_QUALITY 4 // Number of probing steps
 #define SAMPLING_QUALITY 4 // can be 2-7
-#define PROBABILISTIC_BIAS 1 // 1 looks good. can be 0-log_2(N_WARPS) (typically 0-5). 0 is fully probabilistic, 4 is close to deterministic.
-#define ALLOW_WEAK_LINK 1
+#define DETERMINISTIC_BIAS 0 // Should be 0, higher values bias more towards higher fODF values when tracking 
+#define ALLOW_WEAK_LINK 0
 #define TRIES_PER_REJECTION_SAMPLING 1024
-#define DEFAULT_PTT_MINDATASUPPORT 0.05
+#define DEFAULT_PTT_MINDATASUPPORT 0.01 // 0.01
 #define K_SMALL 0.0001
 
 #define NORM_MIN_SUPPORT (DEFAULT_PTT_MINDATASUPPORT * PROBE_QUALITY)
-#define PROBABILISTIC_GROUP_SZ POW2(PROBABILISTIC_BIAS)
+#define PROBABILISTIC_GROUP_SZ POW2(DETERMINISTIC_BIAS)
 
 #if SAMPLING_QUALITY == 2
 #define DISC_VERT_CNT DISC_2_VERT_CNT