It's OK. Normally the TT Smart series isn't considered a gaming rated psu, but that one is large enough to take the hit.
Having a decent psu isn't going to help increase usage. Usage itself is highly misleading as ppl see the number and come to the wrong conclusions about it. The cpu/gpu are always working at 100%, in everything they do (or should be). But things like game code have gaps in the code, only might require using 3 threads out of 6 etc. So while the cpu is kicking that code through at 100% ability, the code itself only requires 40% of the cpu to do it.
Imagine swatting a fly. You are gonna swing your hand with every ounce of speed and energy you have, as fast as you can possibly swat it. But you won't use every available ounce of strength to do so, or you'd put your hand through the wall or break something. Same theory. Usage is the amount of cpu necessary to be used, not how hard a cpu is working.
It simply means that both the cpu and gpu can handle something harder to deal with that requires more resources. It's entirely possible to bog down a cpu that shows 50% usage, because all 3 cores used are at 100% ability+, and the code won't use 4 cores for overflow