I also understand your intention too now, you don't want to train ID becaue it raises IS. Fair point.
With that being said, why do you include ID in your cycle? wouldn't be more efficient to train SB and RB as much as possible before ID trainings, in order to get as least IS as possible?
Because of two reasons:
1) game engine. If I train only SB and RB my C will be regarded as a blank spot on the defense. The offense will run most of the games against him, he will try to block almost every shot and because of this high amount of defended shots he will end up with more fouls. This will lead to the risk of missing out of 48 minutes.
If I keep it even, the possibilty for foul trouble will be decreased. Training and games are a process. If I change one aspect, it will trigger other points in the process line.
2) Let's play it through with numbers. SB 8 is trained until 9. RB and ID get sub. RB is trained until 9, ID gets sub. ID is trained until 9. Now you end up with 9,x in ID. In the next circle for 10, ID will lost likely go to 10 during the RB training. So you can skip ID and switch back to SB.
From my experience with my bigs, 1) and 2) combined bring not the best training result, but contribute more to a well rounded team.
This was Haek:
Js 6 - Jr 7
OD 18 - HA 15
DR 12 - PA 16
IS 6 - ID 18
RB 9 - SB 19
I never trained RB, IS and 1on1. As you can see, there were almost no ups in IS, some in RB and unfortunately quite a lot in DR.