Doug - Don't despair. I think you can shave some weight off. The one I have been dong is even hurkier and I have settled on a weight of 48 grams. I don't know how much lightwiegt molding experience you have but it took me at least 6 or 8 of these before I started getting the hang of it.
I think your mold is so perfect that it may seal to well, even just finger tight. Try tightening down on a feeler gauge for resin evacuation. Somethng like .050", just so the resin can move easily and the fabric will stay.
My layup is 5.7 oz twill, 3.7 oz uni laminate for the boom. 4 layers 1.7 kevlar in the nose alternating 45* - 0/90* . I have been using about 40 grams of resin research and there is a large amount pushed out.
Who made that lifetime mold for you? It is awsome