Do the math when you train so that your players are as close to 99% as possible at match time.

Train your subs/reserves after the game. Take them down to around 80%.

Every 3 hours your players go up 5%, so come back in 12 hours and calculate how much time it is to the next game and train them down to a percentage that will allow them to go back up to 99%.

Repeat every day.