Devil Developments Rollers are difficult to get the car onto if lowered, plus you will get better advise on any issues from Charlie (he does know his Subarus!) although if Rich mapped it you should be spot on!
To give an idea of the what happens at Charlies, there was one of these on the rollers when I arrived:
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2005 Spec B 6MT - KiDO tuned (~270Bhp)
Custom exhaust - Cosworth filter - Samco Intake - Tints - Bilstein B8/B6 & STI springs - SuperPro ALK - Whiteline positive shift kit, rack mounts, rear adjustable camber bushes, front ARB mounts & strut brace, 20mm rear ARB with AVO mounts, - Hardrace Gearbox and pitch mounts - Prodrive PFF7's - Front Brembos - Kenwood CarPlay - 1/2 carbon grille - STI front splitter