I don’t see any problem with that combo. Numeric weapon damage buffs can stack...if you can pull off the moves, you get multiple buffs.

In terms of that combo...roll dodging and setting the enemy off balance...those would be calculated at the same time. So the sets need to be active on the same bar when you roll. But then the buffs run their course even if you swap weapons and the sets aren’t active. So in theory you could have a 5/5/2 setup on a dw bar, roll, swap to bow where you have a 4/4/2/1 setup and for 5 seconds you get +870, then the first buff drops and you get another 5 seconds of +450.

If you decide to test it and want to prevent possibly wasting money, the first thing I’d test is the Armor of Truth proc. Does it proc reliably, or infrequently? I’d get that set first, equip it, then go hang out with some skeevers or low level monsters to roll and quickly check my character sheet to see how well it procs. If it doesn’t go off most of the time like it’s supposed to, you might be better off with a static buff like Hundings Rage. Some sets work really well, others don’t proc often enough. Senche should work fine.