Sorry to hear what a rough time you're having.
Interesting you say it never goes 'on band'. Mine starts off pretty much on band, and as I wind the pressure tuner in it goes off towards the end of travel. It's usually hard to tell where the sweet spot is, as there's not a huge amount of change, and it's more a case of how much of the fov is well defined.
There's been no mention of this problem on the Lunt forum on Yahoo, but there seem to be a few guys who wish they hadn't gone for the double stack option.
cheers,
Andrew.
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