Bill's right; sometimes you can get a lump of Loctite in the rear bolt hole that obstructs the pressure nipple.

Of course, that wouldn't explain why it seems to get leaner as time goes on ... but it would be a preventive maintenance thing to check anyway.

Also, remember that if the tank position is too low, the fact that it's a bladder tank won't prevent the engine from starving in a hard turn. Perhaps the engine is heating up due to successive hard turns with the tank too low ... unlikely but possible ... if you've eliminated everything else, consider that.

Duane Gall
RCPRO