Hi Gordon. I read your HDYGO, and while I wouldn't knock a Polaris for big, deep, windswept places like Irish loughs, I think a light version of a slider would be ideal for the swim you described. "Textbook" advice, imo, nearly always overstates the amount of lead/size of float needed. I was shown the kind of set-up below 20 odd years ago on a clear water pool in N Wales where, despite the depth, the roach would spook from a pole over their heads. It's been my first choice ever since in water of 9' - 14' and can be comfortably fished up to 4 rods out.
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The floats, home-made from foam bodies and peacock stems, take 2AAA, IBB ( or an olivette) and several no 8's. Two have thinner stem, two thicker and I choose according to weather, tow, catching on or off bottom etc. Any less weight, and the rig wont reliably slide (I've tried it) through the ring on the adapter. The adapters are tiny and made by Middy. I leave the adapter on the float - can't be missed out when setting up. I start with the bulk 2' or so from the hook, but move it up or down according to where and when bites are coming. I don't cast with the float resting on the bulk; instead, I put a no 8 or two about 8' above the hook. This means the float is only sliding, in, say, a 12' deep swim, 4', and you're fishing more quickly. I use a 14' rod for its good pick up and because if the swim is less than 14'deep, the stop knot does not have to pass through the rings when casting or bringing in fish. I usually use a stop knot - two, actually, as two will stay in place better and don't need to be pulled down so tightly as to crush the mainline. Anybody who finds stop knots fiddly to tie can use one of those rubber float stops, as this will remain, in a swim less deep than the rod, outside the tip ring. I leave the stop knots on the line for next time and keep the spool for slider fishing. For mainline, I've always used Maxima in 2.5 or 3lb, and find it perfect.
The set up is great for roach and is in no way less delicate than a fixed waggler. It's a bit odd to cast at first - you have to remember you're casting the bulk shot, on quite a long line, rather than the float. But it works a treat. The float lies flat for a sec while the bulk sinks, which takes it down to show 2 or 3" of stem, and the droppers take it the rest of the way, unless held up by a bite. When you get it working right, it's a joy to behold, and I often fish a 12' deep river marina for winter roach just for the pleasure of the method.
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Given your float-making expertise, knocking up something suitable would be a piece of cake.