I was told that unless you want to be a world beater, leave all the exhaust restrictors in, but a PTB is worth the investment big time.
I found starting to be a wee issue with my '06 model when I first changed from a gasser, i've turned my tickover pretty low so it can be a bit temperemental.
First thing is when starting normally, don't touch the throttle, in fact, don't even put your hand on it, it can be very tempting. Second thing is that you don't need a quick action stab like on a two stroke, a rhythmical, slow, long stroke should start it every time.
AFTER STALLING: something we had to dig around to find out about, but we got some gen off Sandiford's and it works a treat. After a stall, don't just kick it as normal, it's very likely to kick back. With the throttle wide open, turn the motor over once to reset the ignition to 'starting mode', then let go of everything and give it the pre-prescribed smooth, long kick. It should rumble into life every time. I made the grave error of kicking it repeatedly after a stall in a section (granted, I was pretty p****d with the five at the time), the motor kicked back so hard that it snapped a piece off the inside of the crankcase!! Luckily my old man is an aircraft engineer so managed to find a fix without buying a new set of crankcases!!!
Took me a good few weeks to get used to mine after jumping off a 300 GG, was on the clutch way too much to start with, revving and dumping just isn't necessary on most things. A nice progressive wind on and off for everything, even when you need to build it up on the clutch is the way forward. Watch Dougie and Fuji, that's where I learnt a lot. The bike is a lot more planted than a GG too, if you're a big hopper and bopper, you may have to learn to temper it a bit. Fewer, but more deliberate lateral front and back movements seem to be the way to go.
Hope that helps!!
Rob