I understand your problem, I had the same concerns too much lift, although I wasn't running a body lift.

You'll want the 1.5" drop hanger no matter what on an IFS truck. From there, you can go with as low as 2.5" or 3" springs, which will have very little arch in them with that amount of lift. I have 3" All Pro springs now and the only problem I have with a grand total of 4.5" of lift is that the pitman arm is a bit too long mainly because the All Pro 3" springs move the axle too far forward when the with the drop hanger set up for 1.5" longer than stock springs. I welded on the drop hanger with the intention of running 4" lift springs that were 1.5" longer than stock. The 3" AP springs are shorter. So, I've ordered a shorter pitman arm to correct that problem.

With the above set up, you should be perfect fine, just mount the hanger so it will fit the 3" springs so you can use the stock pitman arm.

I would personally dump the body lift and go back to stock but if not, you'd only have 5.5" of lift. That's not too bad. Especially if you want to fit 37s. But 4.5" lift is just perfect to fit 35s with some very minor fender mods.

Just make sure you don't end up bending the steering rods on the frame like Harry mentioned. Where you mount the bumpstops will determine this. Even with not as much compression travel as you might have expected, you can do pretty well as the axle will leverage off of the bumpstop for even more compression.

2" springs would probably be to close to call. I wouldn't go any lower than 2.5" lift, but 3" should be no problem.