I'll tell you how I come up with my custom bet spread and ramp. And ramp is just as important as spread. I don't care for the ramp discussed earlier that has top wagers placed at TC +7. Those kind of TC's occur so infrequently in shoe games, that such top wagers are rendered almost meaningless. I am a proponent of getting max bet out by TC +4 or so.
So, as mentioned it all starts with CVCX. Please note the emphasis on "starts". So like most professional players, I play fractional Kelly. I plug BR and what fraction of Kelly I want and then start customizing. First thing is I drop all the amounts above TC +4. Like I said earlier, I want to max bet by TC +4. And I want minimal different bet amounts. 3 or 4 different betting amounts rather than 7 or 8.
Next you start rounding off because you can't bet the amounts that CVCX will give you which are the optimal amounts. And when I say round off, I mean round UP. Starting out with a fraction of Kelly allows you to do this and still maintain a decent RoR. And I want to round up to a really round number. This means not just the nearest $1 or $5 amount, but a nice smooth amount that is going to keep the game flowing, because time is money, plus you want to minimize down time that the dealer is paying and breaking down odd payments. I call that exposure time.
The end result is I will have a spread and ramp consisting of my minimum wager and usually 3 different betting levels @ TC +2, TC +3, TC +4 (max bet). If there is a significant jump between my minimum wager and my TC +2 wager, I might throw in a wager right in the middle of those amounts at TC +1, just to smooth out the ramp. The game is basically break even at that point.
So again, each of these things, rounding up (sometimes fairly significantly), capping the max bet at TC +4, and an intermediate wager at TC +1, all stray from optimal spread, but you make up for it because it keeps the game moving, reduces the different amounts you show, and eliminates that down time when the dealer is paying off odd amounts and a card counter is exposed.
End result, my spread may not look "optimal" compared to software, but when factoring in win rate and increased longevity, it is optimal for my play.