Yeah that is exactly what I was talking about in one of my posts about leveling it to match the rear with blocks. That's too much for keys. Maybe it was the offset of your wheels or the width of your tires, but both
@HiHoeSilver and I cleared 275/70r18s (33.2") before any cranking (granted it was close) and just used keys to level after that. The wheels that both of us used are newer factory take offs with positive (+34 I think) offset. This makes it easier to clear larger tires. My UCAs are not on the stops, so my Tahoe does not ride like a brick and fall into holes like you're describing. I still have down travel. Breaking front shocks regularly is not a good sign and I certainly don't expect to see that with mine.
driver side front tire rubbed inside the back side of the wheel well liner and hit the plastic under the bumper. both sides needed to be trimmed under the bumper.
my lack of ride quality could be due to the truck was a 2500 hd. its t bars are easily twice as thick as the tahoes. its just a 1500 set up. much softer ride.
the adjuster bolts to the keys were like just threaded in and pushing on them lightly. hardly cranked on. even after the keys i had to trim the plastic on the driver side where the ebrake cable runs out the cab, only rubbed when turned all the way and backing up. and those are 33x12.5 wide on a 16.5 wheel. they stuck out past the fender flare by a inch or so. still dont change the fact it rode like crap.
i used to get 50k out of a set of BFG's. rotated every 6k and ran em at 50 psi. only way they last past 30k. i also had many alignments and new parts installed over the years. and never spin and smoke this brand tire if stuck. they melt like butter. pretty soft tire compound.
i also put 3,000 miles a month on this truck, and the one before it. my poor 97 gmc 3500 had 175k on it in 5 years. oil change every month tires rotated every other oil change. lots of fun on a 8 lug set up with just a cross bar lug wrench....at least i could just slide under it to do oil changes lol ill also note, these tires and wheels were on the 97 first, sold that truck and kept the wheels and tires, they didnt rub on shit on the 97 bone stock. go figure right?