What is the PN from HKParts.net?
Spring legs a little over 90 degrees sound like the standard (heavy) LEM spring, but it should also be a very noticeable thicker square stock.
Spring legs less than 90 degrees and assuming the thinner and round stock sounds like light LEM.
I suppose thinner stock spring greater than 90 degrees could be a worn out? light LEM spring.
A couple of references to help you tell us which one:
Another HK45 LEM thread, but different, Pics #8
Light trigger spring, HK light trigger return spring - HKPARTS.NET
HK P2000 Trigger Spring 8.5 lbs - HKPARTS.NET