I think having a motobatt, and thus, no breather is the way forward for me. I'll have to check the charging voltage again, from memory after I installed the new RR it was just above 13v, though I don't recall what rpm I measured that at.
Luckily (well, in a sense), that cover - along with the rest of the engine - is earmarked for for some form of blasting and re-painting when it comes time to rebuild. As it currently is, the whole engine is very shabby looking so the acid damage is just going to blend in
