I have heard this a few times about forum crosses, these bastard low yielder phenos. Not like it is known for yielding but a buddy of mine reported pinhead buds off a forum x also, and Skunkmunkie also reported very low yields bordering on ridiculous with I think it was Forum x Jo, but then everybody else had pretty cool results with that one, Fortune Teller if i am not mistaken. Starting to look like forum crosses have that odd total bunk pheno. Don't hold your breath for flavor either far as i recall they end up total junk. Don't know about the clone only crosses, none I have tried have blown my mind yet. SFV, Forum, The white etc, don't see the fuss.