I had almost exactly the same problems with mine.
I had a brand new set of valve springs turn into junk almost from the start. I kept overlooking them because they were new. I replaced pretty much everything in the fuel system and the ignition twice until I finally pulled them off to check them. They were complete junk. I was in a hurry to get to an event so I put the old set of springs I pulled out back on. FIXED!!!

Don't overlook the valve springs just because they are new.