welcome. first, the adarq.org standard heuristic for required jump height to dunk is 128" (i.e. full normal hand length over the rim). that'd put you right at 41" to dunk, assuming 0.5" shoe height.
you're pretty strong and plenty lean to start with, and you have a respectable RVJ and very respectable SVJ already. i'm a little taller and a little less t-rex than you (5'11", 7'6" reach), but otherwise seemingly similar. i floundered around for years not making much progress, until discovering that the key really is to grease the groove: get as efficient as you possibly can at a specific jump approach.
using a weight vest was extremely helpful for peaking, and some other things maybe also helped -- e.g. DL bounds for max distance, jump squats -- but basically the T0ddday method (search the site) plus low-volume squatting were the foundation for me toward the end. my final numbers were 170 pounds bodyweight, ~10% bf, 350-360 squat, 37-38" RVJ, 32-33" SVJ. the biggest gains came from growing the gap between SVJ and RVJ by honing technique.
