No need for another regulator. The back part of the valve is a reg. Just screw your tank in the ASA and let it rip.
I pulled this off of MCB. Something I wrote over there for someone with lvl 10 problems.
Install your lvl 10 per the diagram....
...with the 2.0 carrier and NO
Air up your marker and fire a few shots. If your not leaking out the front, go up a carrier (2.5). Rinse and repeat till it starts leaking the go back a carrier. Your lvl 10 is now tuned. MAKE SURE YOU USE THE SAME PT ORING (#9 white oring, goes inside the carrier) WHEN GOING UP OR DOWN CARRIERS...VERY, VERY, VERY, VERY IMPORTANT
Your shims are only used if your bolt isn't resetting right after you trip your newly installed lvl 10. Go ahead and stick something down the feedtube or the front of the marker and trip it. If it doesn't reset (leaks) add a shim and trip the lvl 10 again. Rinse and repeat till your bolt is resetting properly.
As for your bolt spring. Doesn't mater too much which one you have installed (gold, red or gray). One thing to remember, the longer it is, the easier it's going to be on the paint. I found that the red spring is the all around spring to use. The gray one isn't meant so much to be used as is. It's for those that want to tinker with their lvl 10 sensitivity. Don't worry about it till you get a better understanding of the setup.