Never been able to fill all internal slots and use all A graded equipment on a Phantom and get the same jump range as an ASP. Yes, a Phantom has more slots - but if you fill them all up... I've not been able to hit even 50ly jump range with it because it uses same rated level 5 FSD Booster as ASP - but is heavier and can carry more stuff reducing it's range. I can only think you stripped the Phantom down on carrying stuff to match a full loadout ASP.