Stretch & Pitch Effect Being Inaccurate

Hi everyone,

The title basically sums up the problem I'm having. I frequently use this effect to create smooth transitions between tracks with different tempos. However, the process seems to be somewhat inaccurate. For example, if I had "Track A" at 140 BPM and wanted to transition out of it into "Track B" at 150 BPM, I might take a section of Track A, and make it go from 140 to 150 BPM (in terms of percentages of course since that's how the effect works), and take an equal section of Track B (in terms of beats) and make it also go from 140 back to its original tempo of 150 BPM. Sometimes the effect works fine, but several times it doesn't work as well, which is a shame because I would love to use this effect more often.

Any tips on how I could make this effect be more accurate besides setting precision on high? Maybe even some suggestions on how I could achieve this same effect but with some other more accurate method?

Thanks for your help!