Your air is fine they are medium pressure so you'll get away with that. You could get an slp reg which would give you a tad more efficiency but not a needed upgrade just ifya want.
That lube could well be your problem. We get ours through one of the team who 'accuires' it through work. I know we have no spare complete tubes available at the moment but if you can bring a small pot with you on the 26th we can sort you out. Unless someone else knows where you can get Dow 55? Check lips maybe if they sell the gats, they have the lube?