I am quite happy with Pacemaker,everything lined up a they went together easy with no droning and a very nice note.
Missing is caused by plugs or leads.Change your plugs at 20,000ks NGK ZGR6B-11 work best with gas,leads can break down on AU at as little as 50,000ks use a 9mm lead at least.Ther is no reason to get the converter looked at as there is no servicing involved.The Tickford gas is controlled buy the ECU so there is not much you can do but should not need to be touched if running alright.I hope there was a misprint with your claim of 70ks out of a tank,you should get between 350-450ks/tan.
As for the air pipe to the T/B you will have to experiment.
Hope this helps
AU series1 Futura Duel Fuel,ceramic coated Pacemaker Headers,Hi-Flow cat.2.5in. exhaust,T-series snorkel,K&N panel filter,D.B.A.Slotted Rotors