Doesn't really apply.
1. Sometimes the 3 hours between games don't mean there will be any 6% increase, from what I've noticed, if the 6% gain is too close to the game time, it will be added after the end of the match.
2. A 50% to 85% might work in theory against weaker opponents, but this is not the case for me, for a number of reasons:
-it would work for lower quality opponents, and every few seasons I lower my team quality to rig the draw, but this I don't do each season, as it is making the game more boring;
-my opponents (level 58) are grouped in a 85-99% quality bracket, with my main 4 or 5 opponents at the 99 upper limit, which is also my quality atm. Opponents are mostly active and improving, even the lower quality ones, and since this is the season's beginning, I expect team improvements on their side.
This means most of the matches are against ready and active players and I wouldn't go with having my team not ready, especially since I am going for the 5th consecutive CL title and 4th consecutive Treble+SuperCup.
I do squad rotation and have a decent team, of course with some improvements needed and limited resources and I tend to keep my well performing players for as long as possible, albeit as substitutes.
But the squad rotation is mainly done for preservation of greens and considering my though matches, it happens in non-key possitions: MCs, GK, DL or DR depending on opponent.
So yeah: I can go with 50-85% condition, but no, I will not. I'll just reschedule the damn matches for now.