So is the alpha squadron interceptor overcosted? Because, after further looking at comparisons, the black sun enforcer is just an interceptor with a hull and shield upgrade.

Yes. The alpha should be 17 points. The stat line is only worth about 16 points, and boost/barrel roll isn't worth nearly as much on a PS1 ship as it is on higher PS ships. (I.e. Fel)

The torpedo slot on the SV miiight be worth 1 point as well, looking at the math.

Maybe... but modifications like Hull and Shield Upgrade are worth less than their cost value.

I'm curious, is any ship considered as cost effective or more cost effective than the TIE fighter? If not then maybe we've been wrong this whole time...

Do determinations of value take into consideration how 2 attack ships are worthless against 4+ agility? It may be efficient to get as many attack dice as possible into your list, but if that's done by spamming 2 dice ships that isn't as powerful as just say, 4 Sigma Phantoms.

It may be cost effective to get 16 attack dice out of 8 ships, but I'd rather have the same or even less attack dice concentrated into 3+ dice shots that will actually hit something. That's less cost effective from a pure, "how many attack dice do I get" standpoint but mre effective in general.

Two dice ships are hardly worthless. Throw enough red dice at a ship and the greens will eventually fail. Having 8 separate attacks versus 4 increases that likelihood considerably.

Do determinations of value take into consideration how 2 attack ships are worthless against 4+ agility? It may be efficient to get as many attack dice as possible into your list, but if that's done by spamming 2 dice ships that isn't as powerful as just say, 4 Sigma Phantoms.

Yes.

https://community.fantasyflightgames.com/index.php?/topic/128417-mathwing-comprehensive-ship-jousting-values-and-more/

The torpedo slot on the SV miiight be worth 1 point as well, looking at the math.

Unlikely. The torpedo slot is worth close to nothing on a 3 attack ship. It's certainly not worth a full point.

Bear in mind that the value of the StarViper's stat line is only worth 21 points. The generic StarVipers are already paying a 4 point tax for the dial and action bar.