Just before I turned in my leased 2001 Sport Trac, Ford sent me an inspection guilde that showed how big/small a windshield chip could be before they charged for repairs. How big a dent, scratch or chip had to be before I would be charged. I did not explain much about alterations so I was concerned about my wood dash kit, bug-deflector and the back window visor.
I called my dealer/salesman and he told me there is no problem with those mods since they are common and add to the vehicles value, or could be removed easily if necessary, He said that vehicle modifications that could lower the resale value where cause for concern, but most add on accessories were OK. Lowering would be one of those borderline things.
I recommend that he go buy the dealer and ask if the lowered vehicle will cause a problem at the end of the lease. If they indicate yes, the remove the blocks and crank up the torsion bars. You won't need to get it realigned since they don't inspect that.
...Rich
