Might try:
1) Inclines with a BB.
2)Flat bench with DB's..get a fuller chest stretch
3) Pec Decks.
Can even reverse this order, if you wish, for more of a pre-exhaust experience. Even with heavy weights.
Doing flys and pullovers is redundant, not needed. Might also drop the total sets to at least half (or more) for that heavy chest program. I would do just 6 sets, total, on 90% days, if you plan on doing a lighter chest workout later that week. If your really doing 90-95% max, than the reps you have given are too high. One or 2 (based on max poundage) would be more in the range of max effort.
Thousands of trainees have applied the heavy/light system, twice a week, with success. Good Luck.