That's good that your customer service experience has been supportive so far.
I followed Tom's suggestion and agree with what he says - the 927/948 combination would be much better for you, so if ARB will swap out the springs it's my opinion you'll be much happier. I don't have any extra hardware on my Liberty like a front bumper, heavy skid plates, etc. and I went 927/948. I have all of the Mopar skids (front diff, transmission, transfer case and fuel tank.) Used Bilstein shocks vs OME but per other users there's little ride difference between the two shock brands.
My ride is great with way better than stock dampening over bumps, railroad tracks, etc. You should have LESS creaking/cracking not more.
Since you have to tear everything apart to get the shocks installed you might as well put the heavier springs on...
2003 Renegade, Black
- 3.7L, 42RLE, 4.10's, ARB Bull Bar, Smittybilt XRC 9500lb Winch, 4X Guard Trans skid, Skid Row Engine skid, Factory T-case & Tank skids, Custom BoulderBars, JBA Front Coilovers, OME 948 rear springs, Bilstein rear shocks, JBA A-Arms, Moabs with Goodyear Duratracs 265/70-16