I've seen this build quite often now, especially on NS LBs (EU #2 uses it too).
I ran some tests with current LoN variations myself and I couldn't see clearly where MoJ/Enforcer damage kicks in. As we are lacking something like recount it's kinda hard to compare. That's why I chose to do TXIII Greed fights (only thing easy to reach and to compare imho). Result was, using MoJ & Enforcer was ~6 seconds faster on the kill than without (had similar headpiece to switch and just dropped Enforcer from gear).
If you could elaborate how those two pieces are applied here I'd be grateful.
Anyway LoN is strong but also starts to raise with paragons. Running on low is hard but getting the gear will take a while anyway.