With regard to your previous comment as to the fit of the Fitzgerald, I have a similarly cut gun club check from BB, a Fitzgerald, and the waist suppression was almost non-existent - cut very straight up and down. It took some tailoring by my alterations tailor to give my jacket some shape, and even now it's a little boxy.
i've concluded either the fitzgerald is an excellent fit for you or there is no hope on earth that it will look good on you. For me, I've never been able to fit into one—there is always a wonky shoulder issue with one that fits in the chest. Since losing some weight, I thought the shoulder issue disappeared—only to discover that the chest is weirdly big on the size that fits in the shoulders. Turns out to get the right chest fit, the shoulder issues return.
My tailor did excellent work, however, in giving it some shape without causing the single vent to gape. I have no clue what magic he did, actually. I'm not a religious double-vent zealot or anything, but do find they are 10x less forgiving with gaping if the jacket isn't perfectly cut for you. For that reason alone, I steer toward double vents (besides the typical aesthetic superiority and SF group think preference for them).