Im trying to find an optimal % of 4bet bluffing in a specific situation, but im uncertain about certain things regarding the math of 5bet shoves.

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Hero open raise 3bb

Villain 3bet to 9bb

Hero 4bet to 21bb

At this point, if Villain folds to my 4bet, the hand result in a loss of 9bb for him (His 3bet). Thus, do I need to make the EV of his 5bet shove bluffs -9bb in order to make him indifferent between folding or 5bet shoving versus my 4bet ?

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Also, is this formula correct for calculating his 5bet shove EV ?

Notes:

1) No ante, Both players not in blinds positions, 100BB effective

2) Villain hand equity = 31%

3) Villain 5bet shove FE = 32.5%

4) Sizings as describe earlier

Formula:

(FE*POT) + (1-FE)*((EQUITY*WINNINGS) + (1-EQUITY*LOSSES)) = EV

(.325*31.5) + (.675)*((.31*110.5) + (.69*-91)) = -9.023625bb

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Thanks to those who choose to help.