For me, I think it might just be psychological, BUT... someone I feel that before the server refreshes at 5am every morning, so basically before I head to bed, I leave my team of 4 as the main with my 3 lowest power ninjas, or even just have my team become just my main and leave the other slots all empty. I somehow feel that my match up for survival is easier.

BUT I REPEAT... I think its just psychological. I don't think it actually makes a difference.

Oh yes, and to add on, I've read somewhere in the forums months ago, someone recommended to reset Survival Trials as the 1st thing you do in the day, cause its based on that power at the point of resetting. I don't know how true this fact is as well. But I always ensure Survival trial is the 1st thing I do.