I was in the same boat as you a couple years ago. I eventually bit the bullet and upgraded to HD OME springs/struts up front, with the additional 1/4" spacer. This gained me 3" of lift over the daystar kit, which makes me wonder how much of a lift it actually is. My front ground-to-fender measurements were at 38". For the rear, I left in the daystar spacer, which put me around 1.75" lower in the rear. I compensated by putting on F-150 load leveling Monroe shocks, which netted around 1" of lift in the rear. Although the front now sat 1" higher, I still loved it so much more than the "lowrider" daystar kit lol.
After running this setup for a year or so, I swapped out the rear spacer for 4" SL springs, which put the rear around an inch higher than the front. You can get these same results in the rear by stacking the daystar spacer with OME HD springs. I love the way it sits now, and would recommend this 3" front/4" rear setup to anyone looking to upgrade.