First of all Air Lube is generaly A T F ( automatic transmisson fluid)
it will work but only if your useing the gun regularily, if the gun sits for 2-3 months with out being used the ATF turns to glue,
especially in the regs. You say your gun is sluggish, I expect you already have the works gummed up. Take the gun to someone who
really knows cockers and have them take it COMPLETELY apart
regs and everything and thouroghly clean everything, also this
would be a good time for you to learn how to do this yourself so watch how its done. When assembaling the reg use a very fine
petroleum grease (not white or lithium) or 3 in 1 oil, oil all O rings
with a Petroleum based oil , at least 3 in 1 grade, finer is better
DO NOT USE mineral oils or gun oil for firearms, these will destroy O rings. Have them take your grip frame apart and give it a thourough clean as well (often overlooked) and use a fine grease
there as well. I have been maintaining my own guns for 15 years
and this is what I have learned. ( the hard way in some cases
)