I want to build a shortboard that flexes more they seem stiff to me.The longboards that I have built flex just fine you drop them in the water and you see them flex.I tried pvc stringers and it doesn’t seem to make any difference.I am using 2 lb foam 4 oz E cloth 2 layers on bottom 3 on top the decks do dent up except where the stringer is.How about no stringer but I want them to hold up.6’6" 2 1/8 thick YOWZA THANKS