Need tire advice for 2014 900XP

Hello everyone, long time reader, first time poster. So much knowledge and information that I have received from the site, it is unbelievable, and for that I thank you.

Anywho, my rzr is completely stock with 27x12x12 bighorns and 27x9x12s. I love the way it handles, but I need to purchase beadlocks due to constantly blowing the bead while running lower PSI. I Cant find any 12" beadlock wheels I like, So my question is, if I go to 14" inch rims and 29x11x14 and 29x9x14 what are the pros and cons for my kind of riding? I ride very fast technical trails, with lots of sliding and drifting, occasional mud if it is in the way.

I would think that the sidewall would be about the same, so pinching shouldn’t be an issue, and with the same amount of sidewall, should have the same plush ride, but I could be wrong. I have also read that the 29" bighorns measure pretty close to the 27" bighorns, due to the 29" under-measuring, is that true? Any advice would be appreciated. Sorry for the long post.

Thank you in advance.