12200411 Timing Advance Impass Reached

[Fast355]

So I was tweaking on the timing tables on my Express with the L31 and noticed that no matter what, it will not run over 34.5* advance. I looked High/Low octane/MBT timing tables and all applicable retard tables and see no reason it should not reach the 42* I have commanded. My guess is that it is an undefined constant not in HP Tuners software. Anyone have luck getting over 34.5* of timing at cruise out of an Express L31 based tune? I was tuning a 4.8 truck the other night and it was running 52-56* of timing STOCK in places going down the highway and from prior experience my other vortec liked 42-46* of timing at cruising speeds. The tight LSA cam I am running has alot of self EGR at low loads and engine speeds and likes the timing. For reference we are talking about the 2,000-3,500 rpm range between 30 and 50 kpa.