By a couple sunfish, do you mean the population of sunfish is a couple or you have a couple species of sunfish?
Generally a combination of bluegill (at least 25:1 ratio of BG:LMB by number) and tilapia (50-100 lbs/acre) work well in Texas. Add at least daily feeding from an automatic feeder and your bluegill and tilapia production can easily double, which increases forage abundance and condition for your bass to eat. Harvest any bass that are less than at least 95% relative weight by two years post-stocking (
https://www.aces.edu/blog/topics/fish-water/fish-relative-weight-calculator/). Keep the bass population low by harvesting under-performers and you'll have giants in a few years (assuming the pond has good water chemistry and about 30% of its area occupied by some type of cover/habitat).