Hi all, I need your expertise on this one, as I am new to spearfishing, I just bought an Omer HF2 90cm. and the rubber band is 18mm 22cm long (standard i believe). I could not load the gun, I find it too heavy to pull back. took me over 30 mins to load, after shooting it, I was too buggered to load reload again. Is it because i am too weak? or the rubber is too short? n big? should I get a 16mm rubber for the same length? or 18mm for a longer length? if so how much longer? or i just need to go to gym n pump up my bicep n tricep muscles? Thanks.