that's why the 2.5 kits are higher than advertised... for the purpose of adding weight. You could add the pucks. it will probably bring it back to non-added weight so your good.
I added a .5 inch spacer up front and a 1 and spacer in the rear when I installed my lift, no problems whatsoever. I did this specifically to compensate for bumpers and accessories that I was going to add and to get a little more height out of the lift works well for me.Did you add the leveling kit back, and if so were you happy with the results? I'm considering the same.