I'm a little unclear on how you described your solution, so a few quick questions:
Would adding two identical bonuses that auto win on exactly 7 cards totaling <22 solve the problem?
Would you still get the win/loss as a result of the hand? (Said another way: if the 7th card gives player 21 and the dealer has 20, does the player get paid again because 21>20?)
If the win/loss above is an issue, if the multi-strategy for a CVCX sim was set to hit at any time the player hand had 7+ cards (until you bust) it would result in losing the initial bet, so adding a third bonus of auto win, 7 card, <22 to pay for the bust would cancel that out. This could ensure the money won/lost is correct, but would make the win percentages inaccurate.
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