I think it's fine. solid axles articulate at angles, they don't always go up and down. the leafs don't care, the thick azzed timbren can take that no problem IMO.

If you look at Timbrens site, they show an illustration of a seriously squashed SES helper bumpstop that is bulging more than the one pictured here.

also, I don't think that tire is stuffed all that much. you can see most of it still. As always, your combo may vary. I say weld your bumpstop bracket to the exact height you need for your intended tire size.