Likes & dislikes in powder are not all that different from opinions on good whiskey.
For what its worth, the du Pont mill in Moosic, Pennsylvania blew up about 1971. GOEX, by whatever name, bought it & began making powder. They changed the formula slightly, buy using well water rather than condensate from the old steam engine. Amazing what all lives in well water & what it eats. Learnt this from The Expert on black powder, Billm Knight a.k.a. Evil Ogre, Mad Monk, et alia.
"Moist burning" used to sound like rose fertilizer to me, but learned not so. The temperature to which the wood is heated to char it affects how much creosote remains in the charcoal. Disremember the proper temp, might be around 500C but good charcoal makers are careful about charring temperature. In turn, creosote is the only component of black gunpowder that makes water as part of the combustion process.
Me I like Swiss powder, it is hotter than my old duPont. Can't comment on the fouling. Never got around to GOEX. There is a cheap brand
If you find any decent powder, Swiss/GOEX/Schutzen, &c, I agree even in today's market that second mortgage idea isn't all bad.