I have a fairly wide butterfly, but I've noticed as well that it strains my hip significantly. Gonna work on narrowing it down, but in the heat of the moment when you're scrambling around the bottom of the net, tension on the hip/groin is pretty inevitable. It's not like I'm 45 either, I'm 21 and already feeling some of the effects of using the butterfly.
Ended up trading up to Reebok Series IIs. Only a 31" but they are very stiff and feel like a 32 compared to the much softer Brian's I had been using - the RBKs hold their size and height very well over time. I've found that getting used to the wider RBKs has been a much bigger adjustment than the height difference.
Also just picked up a pair of Don Simmons senior goal pants (got a great deal). Fits 32-38", much larger than my measurement, but they take up a lot more space and close up the gap between my thighs so I have no complaints. Can't wait to use them in game.
https://www.donsimmons.com/ecom/product/998