Just back from an Andro trip this past weekend myself. Water was quite high on Saturday making for some lousy wading. We needed to resort to "old Man fishing" (sitting on shore, drifting a line, and waiting for strikes). Fishing was slow, but we eventually did find some size: 20, 17, (2) 14 in Landlocked, (2) 16+ 'bows, a ton of small LL, a fair amount of 9-12 inch 'bows, a handful of 8-10 in brookies... and sadly more smallies than I like to think about. Swamp caught a nice sized one at Errol Dam - fun to catch, but not a good sign as they have really taken hold there. He had a good weekend, catching over 20 fish on his first weekend flyfishing. He's a natural. Overall, we caught about 60 between the 3 of us, 10 quality fish. They don't come easy: we were out there about 12 hours in all.
I'll be back on the river the same weekend as you, Artex, again north of Berlin. You want 'bows? You'll find them pretty much any spot alongside the Andro, but you do have to work for them. If you plan to stay in Maine, the confluence of the Wild and Andro just before dusk has produced well for me in the past, occasionally drawing sopme large browns up to feast on teh many landlocks in the cooler water of the Wild.
The Wild: some small muddlers always seem to produce there. Tease them between the rocks at the head and tail of the small pools and riffles. depending on your prowess with dries, floating a small elk hair caddis does some damage also. And a Hornberg never fails. I'm not a Wild River fan though: too much work for too little success. Had a lot of famine there with never a real feast. Good luck!