ofc you should always change that 0.0002 into 0.00021, or the 0.0001 into 0.00011, this Changes Your Frown to a Smile
There are plenty TX waiting currently, in fact we have an all time high that tripled the previous high. Some even report that there over 50K TX waiting for confirmation. I would not change my behavior regarding fees just because someone is doing a stress test of the network.
I wouldn't be changing it because 'someone is doing a stress test' (odd stress test that, since the core client rejects those transfers as dust), i'd be changing it because .00001 (or .00000001) is worth nothing, yet puts you ahead of all the .0001's