FCR 41 Jetting/Mixture Screw Advice

Phew! Only had my Berg 4 weeks and I don't seem to be out of the garage fiddling with it it! If it wasn't for this site i'd be tearing my hair out!

I had some problems with the bike holding an intermittent high idle when warm so I thought i'd start from the beginning and make sure everything was setup right.
Upon checking the idle I noticed the mixture screw was wound 2 3/4 turns out and it's not until you wind it all the way in bar 1/4 turn that the idle starts to drop? Surely this is not right.
As far as i'm aware from the previous owner the jetting is as stock.

My bike is completely standard bar an Akro slip on (no baffles fitted), I live close to sea level and use the bike on the road.
She runs really sweet, snap wheelies in first, pulls nice but does pop alot on deacel and is maybe overly snatchy in first.

Any advice on jetting would be much appreciated as i'd love to curb the popping a bit and get the mixture screw sorted...

Thanks for the link Steve, I did read through that before but got a bit lost in it all I have to admit....

Am I right in saying I need a larger Pilot jet (possibly a 48) and Pilot screw (PS) is another term for the mixture screw?

FERACER - valves are all good thanks though

Taffy - Ok cool, right time to put some effort in bear with me as this is my first fiddle with the carb. The 4mm allen screw holding the needle down is bloody tight, is this ok? Am a bit worried about giving it some force....

Thanks wildman, you were right I gave it some and it 'cracked' undone

Taffy the needle code is OBDVR and the clip is second notch from bottom.....