I use a Gamakatsu B10S stinger in size 6. It's actually a fly tying hook. Thin wire. Real nice hookup. Usually use on 4lb, sometimes 6lb, wouldn't use with 8lb (hooks too light weight). I hook the minnow just under the front end of the dorsal in the meat of the back. Hook is fine enough that it barely injures the minnow, keeping it lively.
Here's a link:
http://www.caddisflyshop.com/gab1stho.htmlAlso, hooking through the nose exhausts and eventually suffocates the minnow. Making him an easy target for sniffing and nibbling. A lively minnow makes the attacker commit and eat the bait.
The dorsal hook does not pinch the mouth closed, does not drag the tail down (as in tail hooking), and holds the fish in a position that does not require it to struggle. Thus keeping it alive longer. However, struggling minnows do attract more attention, they just need replaced every ten minutes.