I would leave out the 290 because for more or less the same weight you could get a 391 which cuts as fast as the 362. That is at least what Thall(a well respected member & Stihl dealer here) says. Since you are a home owner forget the weight and rebuild discussion. It is sensless! Thall and others have shown in multiple threads that the clamshell design is just as quick to repair as the split case if you know what you are doing. Many others have described in multiple threads that they use the home owner league profesionally and are totally happy with them. The price difference, at least here in Austria is >250€/>300$. You can get a lot of chains, 2 stroke oil and gas for that.
Don't misunderstand me, I also am a homeowner and have 2 pro and one homeowner saw. But I only have them since I got them used or at such a discount that they were cheaper than the homeowner model. I just don't believe in the line that used to be popular here "the Stihl 361 is a holy tool, it cures cancer, never needs to be refilled or sharped and who holds it is enlightend to higher .....".
I understand you are having problems with your 455. The chaintensioner is not working to your satisfaction. Is it a new chain? They tend to lengthen in the beginning. The recomondation of Stihl chain is great. They are pre stretched at the factory.
In your user scenario, a farmer/mid range chainsaw, from any of the major players (Stihl, Husqvarna, Solo, Dolmar/Makita, Hitachi/Tanaka, Echo, Efco/Oleo Mac) would make you happy.
Good luck,
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