I've never herd of any tullibee being caught from open water. Doesn't mean it's not possible but I'm not going to say you can go out and slay em. Hopefully others chime in and answer you question with certainty.
I would say it's fine. M-MH are very good for many things just need to be careful when throwing things heavy if it's close to the max lure weight. That's when bad things happen. Didn't really answer your question but hope that helps.
30 inch walleye
40 inch pike
50 inch musky
11 inch gill already have Got one about 10 3/4. And large mouth I'm good with at about 24 inches around 6lb. Definlety well worth the wait when that monster comes to the surface. Nothing better!
Last year I went to the show to buy and thought Reed's would be the best and they came through again. I bought a Helix 10 from them and I got a free mapping chip. Below the price everyone else had at the show or outside the show. Also got a cheaper price on a new MinnKota that integrates with the Helix 10. When all the smoke cleared, I had everything in about 10 days.