What you are describing is why I prefer the 20 over the 29. The 29 is only 3.7 inches so you are going to have more muzzle flip especially if you are not using the grip I described above. This will aggravate the issue you are having more due to the design of the 29. The new Sprinfield Armory XD -M is 4.5 inches and the grip is thinner and comfortable to shoot. If there is a place near where you live that rents guns at their range so you can test fire them maybe give it a try to see if you prefer it better. Also Rock Island Armory makes a 1911 10 mm double stack so you get 16 + 1. Those are a couple of 600 and 700 dollar options. For grizzly bears I would stick with 10mm over the 357 sig. The 357 sig is accurate, fun to shoot and would work great east of the Mississipi. If you are not familiar with Underwood Ammo check out their 180, 200 grain fmj and the 200, 220 hardcast bullets velocity numbers to what you are currently shooting. Not all bullets from manufactures are created equally.
If you can find a H@k 10mm like 82 said they make a great product that I would recommend to anyone.
If you decide to go the 1911 10 mm platform like Springfield Armory, Colt Delta, Sig, or Dan Wesson I would recommend you go with a rail gun to add a light especially if you are sleeping in the field or going to be out after dark. Stream light and surefire are good options and once you decide on the gun and light configuration there are holster makers that will custom build a nice chest rig for you.
If you stick with glock research this company. I put a six inch in my 20 with 24 pound spring and upgraded the guide rod. Handles 220 hardcast bullets and handloads with no problems. A 20 to 22 pound spring should work fine in the 29.
https://kkmprecision.com/product/29-match-10mm-4-50-2/
The glock store offers this procedure or a DIY dremmel. There are YouTube videos if you are interested. I wouldn't but that's your call.
https://www.glockstore.com/Frame-Cut
Best of luck in finding something that you will enjoy owning and shooting.