tswaboda-what do you like about the 12?
First off, bottom zoom just isn’t something I use. I rarely do the typical sit on Mille Lacs or LOTW walleye fishing in 30′ like I think most midwest fishermen do. But the main reason is my FL-12 gives a stronger reading with less gain and clutter than the FL-20s I have. I have no idea why that is and it took me awhile to figure out, but I’ve compared them swapping the 12 & 20 head units onto the same case/battery/ducer in the same hole with the same jig and there is no doubt the FL-12 gives a better reading. I actually sent a FL-20 head unit into vexilar when I first found that because I thought something was wrong with it. They tested it and replaced a couple small parts for free but after many conversations they basically told me there’s nothing wrong with it. And they’re right, it works just fine – just not as good as the 12 I have.
For the vast majority it would be just fine, but I do a lot of lake trout fishing in big groups. That’s probably the most challenging conditions for flashers. Deep water, hard bottom, fast sloping structure… it’s an interference nightmare for any flasher if you turn the gain up high.
I have not used a 28 or 30, but they are probably better.