OK, Took to the task of resolving the SDHQ bump plate & Atlas leaf pack compatibility issue. It was easier than I anticipated. I didn't need to drill out the bump plate holes to allow them to sit over top the OE atlas Ubolt kick plate. I did however have to use a cutting wheel on bump plate so it would sit flat between the Ubolt kick plates ridges. If you look close at a blown up picture you'll see the notches near the L bend down to the axle housing. On the drivers side it came close to cutting into the "punch holes". But even if it did there would be no issue as they're only secured down by the one Ubolt on the axle housing.
Something else that I learned on the first side to save you some time and frustration. Bang down the Ubolts and center pins BEFORE you try to get the bump plate to sit flush on the axle housing. I spent some anguishing moments trying to figure out why it wouldn't sit flat near the spring pack. After tightening them down bingo all good. While the wheel cuts don't look like a thing of beauty, it fits properly, functions as it's designed to. Again the SDHQ bump Plates are designed to use with Deaver leaf packs. You'll need to do this fab to make them work together. Frame supports in and ready to do grab some seat time. On the way home I took a detour into one of the many empty quarry trail systems. Very rocky and narrow twist backs. Maybe eight miles of round trip hot lap run. Very happy. So with the longevity aspect of the test and some minor aerials to do, I couldn't be happier. Yes there is some feedback into the steering wheel on high speed bumpy cornering but this isn't a worx truck. It's a big improvement over the OE springs. When the leaf packs went on they improved that minor issue a great deal.
Great performance, balance and value. Considering many alternatives you could choose to get the exact same result this really is a no brainer.