Originally Posted by
Amane Ito
The problem don't lies on how many matchs a player played, but the ratio of match vs training. The best form is maintained through a healthy balance between them, in order to keep the motivation value stable.
If you can use the same keeper for two competitive games a day, and his form never dropped below 7, you must have used green packs on him. If you didn't, you will suffer a bad form GK. Same as other positions.
Form 6 MC isn't that bad but they are rubbish compared to form 7 MCs. MC is the most demanding position in the game which make them suffer the most injuries, cards etc.
Unstable form is usually created by sudden form drop from a rare random event. In such case heavy drop in morale can been seen, when this happen and it could be fixed by using morale pack, the form will stay normal as if the unusual form drop never happened.