Like I said on the other thread, Elise, it may be that the FF has stretched his little tummy and the EBM, even if you were to give HUGE quantities, would never be satiating as it never sits around like formula does in a little tummy...it runs straight through.
My kids are far from small but born very thin for their length at birth - both were 23 and 23.5 inches (58 and 59 cm) and only 7,11 and 8,1 born. It was actually Oscar, the longer and skinnier one, who was the one to enjoy "sucking on empty" that coped well with GSs, due to the fact that he could and WOULD suck on an empty breast. He was on 97th centile for both weight and length by 4 mths (8kg and I don't remember the length, but very long). Emma was very impatient (due to her TT, temperament or both) and would never ever feed unless she got a letdown in the space of about a minute. Ever. It took her till 5 mths to "catch up" with her length. She did, however, become the better "eater" of the two once onto solids and still is today, if that's any consolation!
Fenugreek only helped me when I smelt of maple syrup too. I took 2 caps three times daily and it took up to a week for my armpits and pee (TMI) to stink of maple syrup!
S x