I wish I could help you but the only thing I know is that the Glock 29 is a beast. I've heard that it shreds those aftermarket recoil buffers to pieces and with the addition of a 6 inch barrel it becomes the most powerful Glock that you can get.(note - please do not put a factory 6 inch barrel for the G20 in your G29. The lugs are different and it will make your firearm lock up.)
I personally carry a Glock 19 along with 1(or sometimes 2) spare mag(s) right now.16 rounds of 135gr and 15 rounds of 147gr Federal Hydra-Shok ammo in (each of) the spare mag(s). I feel like the 9mm has a nice balance to it, the recoil doesn't negatively affect follow up shots, has decent power without over penetrating, its cheap, easy to find, and its easy to carry lots of it. I feel that in a defensive situation it might be more advantageous to have 2 rounds of 9mm rather than 1 round of something more powerful/cumbersome like 10mm or 45acp.
That being said I would still love to try shooting a Glock 29.
I would also like to thank you and give you a high five for loading your own rounds, being cool enough to shoot 10mm comfortably, owning a Glock, and making such an awesome first post!