i have decided to build my first u.d.s. i know all about the little lol , thread on here in which i've read a little over 100 pages and breezed thru a few more...i have all the info i need and have my basic design down but what i still don't know and would like to know is what's the best vest design??? 4 vents with 2 nipples capped with 2 ball valve or 3 vents with one nipple capped and 2 ball valves or etc etc ?????