Jkhan Krosa Noblesse Tuneup

Hi guys I have a quick question on my Jkhan Krosa Noblesse I am new to this rifle I have had several pcp's now which i had tuned which where my air arms s200 air arms s400 and air arms s410 and I didn't find a problem with those has they where good to tune using the hammer spring and transfer port. But I have found with the Noblesse when I have taken it apart the only part I can find on the rifle to adjust is the hammer spring. If anyone on site has any experience with tuning this rifle could you please drop me a msg explaining how to do so. As I cannot believe the only adjustment there is on the Noblesse is the hammer spring and making the transfer port larger so any help guys would be most welcome thx.
 
MddogHutty, make a call to Nick at Air Superiority he helped me to install a Huma Regulator into my Noblesse. Prior to that, my JKHAN Noblesse was way too hot. I chrono'd JSB 18.13' at 1037fps. I installed a lighter hammer spring from Wild West Airgun's, and the Huma reg. It transformed the gun and allowed me to get my velocity down to respectable levels (890fps), and shot count to over 60 shots per 2900 psi fill.
 
Thx for the reply just wondering do you have a link to buy the spring you purchased or do you happen to have your old one has I have been trying to get a factory stock version for some time now. But I am new to the airgun world has of last year and don't really know where to look for the right spring or size I need for the noblesse. When I bought mine I asked about bringing the power down and I was told by someone online to cut it in half, so me thinking he new what he was talking about, has the reply was on one of the forums, listened to him, and now it is firing quite poorly so I good do with a new spring if you could help in this I would be most greatfull let me know thx.
 
Thx for your message rami i have been trying to find a company what sell them all afternoon talk chat online with customer services emails and cannot find anyone in the UK which sell those exact diameters. I just don't get it i thought i would of been able to order online from a company but that spring maybe specialized so i have emailed Msmaster-carr to see if they would possibly send from the states have to see on that front.
 
That is the problem rami, I had already cut the spring in half from the advisement from someone who said that was the way to go wrong advice, big mistake power is terrible. I'm having to purchase a HUMA Reg just to combat the problem that's how bad it is at present. The reason I am after a new full spring, is now that I know what to do I can take a couple of coils of like you said or just wind the hammer out slightly. Where at the moment I don't have that luxury. Would you know where I could purchase one from which would post to Europe. I got intouch with mc-master -carr and they wouldn't post to Europe don't know why really, if its getting paid for and postage don't see how it matters really but thx. If you have any other suggestions on how to get one i'e Europe that would be great.