If I am reading and following the dialogue correctly....he had the same problem on gas - reference post #1958146.
From what I understand here...He is dealing with a compromised combination.
11-1 with aluminum heads and the typical camshaft profile will require a bunch of chamber heat or the glow plug effect of a abnormally hot plug - thus the reason for so much lead.....if in fact it did perform better with 48ยบ (plus) and assuming TDC is accurate.
