Can't find an old file I put together many years ago and had saved on my computer for years (and the hard copy would be buried in storage someplace), so this is just from memory FWIW.
With a long developed shooting techique for my Contenders and after market/custom grips that fit my hand perfectly I never perceived any difference in torque myself no matter how mean the handcannon, but a possibility that might effect torque for some lefties for certain barrels that don't bother the rest of us might be because over the years at least some TC Contender factory barrels have been made with both R/H and L/H twists. Some early barrels were R/H and generally slower twist than those their later L/H twist barrels, but without the file I can't remember for which or if all cartridges except for a couple I actually sought out for specific uses for IHMSA matches myself some years ago. Thinking about IHMSA brings the 32-20 and 30-30 to mind and I've had them with both R/H and L/H twists for specific uses. Easy enough to look down the bore to see which twist your barrel has - R/H or L/H. Not sure if this also holds true to all of the barrels (again without my file) but another easy clue at least with the two cartridges mentioned is the R/H twist barrels had 6 lands and grooves while the L/H twist barrels had 8 lands and grooves.
As suggested the grips do help tame torque and recoil, but your shooting technique can also do so quite well. Easy start is to have custom grips made that actually fit your hand rather than using the "fits all" generic ones TC offers. There are several good TC grip makers around that charge reasonable prices and offer everything from utility to exhibition grade sets. Most of mine were from Bullberry, but I also had a lot of Pachy sets as well.
Might or might not be a factor in your case, but food for thought anyway.
HTH
L.