Ha! You beat me to it. Great minds.... or one good one (you) and one extremely scatterbrained one that can just remember snippets of info every now and then.
O there's a simple solution here. Just trade her in on a brand new ported one! lol. In all serious though. IMO these boys have steered you right where you need to be. If you changed the plug and checked your spark arrestor screen than most likely the carb is gummed up. Here's what my solution would be. There has been lots of good luck with the farmer tech brand carbs sold by hutzl on ebay. And if your weary about ordering from China well we can fix that too. Cause I would almost bet the poleman has one on hand. May even have a modded one on hand. I would order one of those up and give her a try. But also on one last note and I'm sure you've checked the air filter can also cause the saw not to spool. If it pretty dirty and can't suck the air through. The HD kit can hide alot with the prefilter. But that's easy enough to check. just pm me if you need some more help or more info and I'd be happy to help ya out.
I think the carb I bought was hultz? I have bought lots from them anyway. It comes in like 5-7 days. I could of ordered from one of the other chinese sellers though...its the same carb I am sure though.