http://en.donkr.com/forum/optimal-3-...-part-1-533561
I recommend you give that article a read. I need to do so again and take some notes on it myself.
To answer your question about value:bluff combos in 3bet ranges, I think the number you are looking for is 40% value (intending to shove over a 4bet, even 5b bluffs like A5s fall into this category) to 60% bluffs (folding to a 4bet). This is assuming that the villain is only going to play a 4bet/fold strategy when faced with the 3bet, such that you don't get to realize any of you bluff hand's pot equity (since you always fold when they continue).
So you determine what hands you can 3bet/shove for value (have greater than 50% equity against villains 4bet/call range). Then you add in 5b bluffs with hands like Axs/etc. Enough combos so that the worst hands in villain's 4bet/call range is breakeven. This gives you your value 3bet range (shoving over 4bet). For every combo in your value 3bet range, you want 1.5 combos in your bluff 3bet range (folding to 4bet) to reach the 40:60 value:bluff frequency.
Fwiw, this is assuming 3.5x open, 12x 3bet, and 27x 4bet. The frequencies change a little depending on sizing.
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