First bits easy.. p81 on shooting at flyers-hard to hit.
"*shots* resolved at a zooming flyer can only be resolved as snap shots",so whilst they unnecessarily love the word resolve (new tau codex has some awesome words in V lovecraft in their repetition),on the shots that you fired at the flyer have the
BS lowered/effected by whatever ruleset thingy your applying.
EDit Oh hang on are you asking whether
POTMS overides the to hit nerf??? It doesn't matter what your
BS is.. when you fire it you become as if
BS 1 for resolution of shots aimed at flyer, after modifiers and gumph..
Edit edit Oh hang on you have skyfire.. you ignore all the above and just read the skyfire sentance,.
edit edit edit ..oh fudge.. your question made me read backwards.
EDIT EDIT EDIT EDIT EDIt..
FAQ "Q: Can the BS1 of a Snap Shot ever be modified by special rules that modify the
BS of a model’s Shooting attack (such as Tau
markerlights, Space Marine Signums or Sergeant Telion’s Voice of Experience)? (p13)
A: No.."