Made a new post about my disappointment with my stock tires so I wont go into that. Just had Lionheart 295/40/R21s installed. Local non chain shop. They said they were not sure they would fit but they would try. They got them mounted and said they will pray for anyone who has to get them off in the future lol. I am not sure how much weight is normal when balancing tires but they said they wouldn't add more then 8oz. All 4 were under 5. Dont have more then 20 miles on them so cant exactly form an opinion just sharing that its possible as many others have said.
Adding weight is part of the process, but many shops skip an important step: road force. On our tires, 2.5–3 oz is starting to get up there. I've used less on 33" off-road tires on my truck; the key is road force first, balance after.
Correcting the position of the tire on the wheel to reduce runout is critical for a smooth ride, IMO. You can balance an egg, but it will ride terribly. For our tire size, I would not be happy with any road force above 20 lbs and would really prefer less than 15.
The challenge is getting the shops to properly road force. Discount Tire, I have found, won't, and I have to basically supervise to get them to not only do it but also make the proper corrections. Example: The machine might say the force is in the green at, say, 17 lbs of force but is predicting an improvement to 8 lbs with a 1/4 spin of the tire on the wheel. They will not take this additional step unless you hold their hand.
I have also rejected tires in the past if the force was too high and could not be improved.