Re: Pick-up squealing problem
That's weird. My friend has a Mex Fender Strat that used to do that. It seems that your pickup is excessively microphonic. I'm not sure what would cause that... I would've suggested lowering your pickup, but you've already tried it and it doesn't work. Could it maybe just be a duff pickup that needs changed? How long has this been going on?
On second thoughts you may have a shielding or earthing issue. It could be interference from electrical appliances, e.g. lights, TVs, digital alarm clocks... stage lights are also notorious for causing noise.
Hope this is of some help