Sounds like the 353 would make a nice companion to the ported 262. I think you would probably enjoy putting a 346 P&C on it as that makes them a good bit zippier.Thank you for all your replies. As mentioned saw is for limbing only as i use a 24" ported 262xp for most of my felling and yes i do all my own maintenance. Weight, price and repairs seem to be pointing towards 353.
I bought a new 440 last week but it seems like a toy and im not expecting it to last. Chain guard got ripped out on second use so probably going to get a 353 while i can still get hold of one.
I chose the 440 over 550 on reccomendation and without too much research. Deciding factor being weight and didnt realize it was a clamshell. 550 seemed too close to 262xp in weight.
Im in New Zealand and here warranty is 2yeard extended to 5y if you buy 1l 2stroke and 5l chail oil with your saw.
If the 440 you have there is on the same chassis as the 440/445/450 we have here, they are great saws and it sounds as though you were misusing it. The 450 is also a clamshell as you said about the 440, but it has the same specs as a 353, and they are my favorite stock plastic case saw. The bummer about the 440, is it's has much smaller displacement than the 450 and it weighs the same

Yes, the new 550mk2 is a bit on the chunky side, but they do run very well. But for that very reason, I prefer a late model 550mk1, they had worked all the bugs out of them and they are a good bit lighter than the mk2, and they handle like a dream for limbing. I just ran my 2018 550mk1 today, it has a muffler mod, and it ran great.