Wait, I'm confused... So your older Dox has 65g springs in its switches and the new one has stock Clear springs from the original Clears?.. That would certainly explain the difference. Unless I have misread that--it was written rather ambiguously.
Sorry, here's the sequence of events:
1. Received first ErgoDox (Full Hand) w/ Clears from MassDrop Round 2 around 6/4, put 65g springs from Originative in during assembly.
2. Use first ErgoDox w/ 65g springs for two months
3. Receive 2nd ErgoDox (Classic Case) w/ Clears from MassDrop Round 3 around 8/15, assemble with stock clears on 8/25
4. Swap out 65g springs in Full Hand ErgoDox for original stock clear springs that were removed during assembly.
5. Notice that the switches in Full Hand ErgoDox are quite a bit lighter than new switches in Classic Case ErgoDox
it's the plastic stem and the leaf spring..
This is the only thing that makes sense, as I did wear in the stems and leaf springs of my first ErgoDox for about two months before assembling my second one.