yeah, a bigger cone piece may help, ive got a yoda bong, four hoses, MASSIVE cone, takes a couple grams straight, without mixing.... retty darn good, but for a home made one you wouldnt really need one, as for a mouth piece, dont think ud need one, but if u have one go for it, if u want i can also draw a diagram for ya and post it here..... it may help you a bit....