My experience was hooking up the vacuum advance line to the wrong port. Where you hook up should have no vacuum at idle and then pick up with engine speed. I accidentally hooked mine up so that it was advancing at idle and then drop back under load. Your problem sounds kinda similar, I would check that first. Have you checked your timing?
1977 CJ7 -- 304, SM465, Dana 20, custom front radius arm, Dana 44/14 bolt with 4.56 gears, 39.5x13.50-17 Iroks,
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98 Wrangler - 2.5L, 5spd, 4" Rough Country lift, Homemade Highline, 35" Buckshot Mudders - SOLD