As I mentioned in my intro post I am new to twins and looking for a bit of advice - I have 1998 Firestorm (well duh!

Now it starts off the button and idles really well about 1200 rpm no lumpyness there is an ocassional popping from the cans at tick over - the main issue is when I am ridding the bike feels if it is holding back and contrary to what I have been told I am up and down the box like a fiddlers elbow - when the bike is getting to the 70 mark it pulls well but when in traffic (about 30/40) doesnt like top gear - when acelerating up the bike is lumpy and can feel vibrations through the engine
I am going to service the bike when I am doing the CCT's to see if this will make adifference - now before I get the carbs balanced I am looking to seeif any of you good peeps can shed some light on this or have experienced this -
I have had the thought it might be drawing air from somewhere (any obvious VTR issues here

Many thanks in advance for any help
Del