Shadow85- I hear the current Cyclo white pads are a bit softer than the ones I have, but even those were fine for LSPing. IMO most of the hair-splitting about which pads to use for such stuff is unnecessary; you want a pad with no functional cut of its own so you don't instill any marring. Beyond that, different foams will work "better" (scare-quotes intentional as the diffs will be minor) with different LSPs. The only LSPing pad I think is worth getting excited about is the LC gold one, and I dunno if that comes in 4".
Other than that pad, I'd just try something and see how you like it, with no worries about it being "the wrong one" in any meaningful sense. Is one thicker/thinner or otherwise more/less appealing to you? Go with what you find appealing.