Mines on JOM coilies and I think the drop is 120mm. There is 170mm of thread and I have like 10-20mm left and my splitter sits an inch off the floor.
Seems odd how it sits with a 120mm drop all round. If you really, really don't want to raise the back, then your going to need to remove the helper springs from the front coilies. Will probably bring it to sit about where you want it. Then space the front out to match the rear (in terms of flush-ness).