At least you know that you got "real" Coleus Forskohlii - that's a side effect: increased water and motility in the gastric tract
You can try taking smaller, but more doses - but you'd have to check the studies. Extract %'age doesn't matter: 20% of 250mg is the same (actually a smidge more) as 98% of 50mg. As long as it's "legit", maybe look for some 10% caps so you can go less, more often?