For the love of god 8. I reckon Vai's most enjoyable work was on 'Eat em and smile'.
Cliffs of Dover 8.
Eruption - 10
dont know the others
Passion and warfare 9 - though the first half of Fire Garden is better only to be let down by an inferior 2nd half.
Surfing..8 - Flying in a blue dream's the tops
Ah via musicom - 7 but would be higher if it had been an all-instrumental
VH 1 - they never got better than this
dont know the rest