I know when I lag, and I know when my brain lags. And I know I was fairly bad @ Titan before using my free month with WTFast. And I know I was much better during that month.
I can tell the difference between dodging and thinking "oh that probably wasn't fast enough" vs times it should be fast enough.
It wasn't till after that free month of WTFast and doing Titan again without it and having several instances of thinking "oh good, was fast enough to dodge that", then finding out the game disagreed, that I knew for sure my latency is a bit bad for those fights.