I think that your set up is perfect for hogs up to 137 pounds, however anything above 137 probably should be turned down.
BTW As I recall, Barry W. uses quite a bit more bow than that and due to difficulties he faced, was run up a tree twice in one day down in Texas, the last time culminating in a broken wrist, cactus spines in half or more of his hand and a near problem (his kicking the hog while he (Barry) was down saved himself from "problems").
We need to be careful with advice asked for. Yes, a 30 lb bow can and has done the job, on occasion, and 65 pound bows have not, on occasion.
ChuckC