Lots of good advice. Sorry I feel for you on your back pain, tough go getting things done with a bad back. So that said here in PNW lots of guys run longer bars. Your husky will run a longer bar a little slower, if you go to a full skip round chain which is little less aggressive then chisel tooth FS. Round chain is slow then chisel but for the most part stays shaper longer. The full skip is more prone to kickback and doesn’t run as smooth. Sorry if I missed what kind of trees your cutting that will make so different and some cuts you may not be able to lay on the dogs. Just let the saw run and keep the chain speed up. The light weight bars are pretty good this days you won’t notice much different in wear over steel bars. The thing to know is you can’t hang the you saw out of the tree when falling it’ll bent. As for oil just make sure you oil adjustment is cranked all the way up there is a screw on your saw for this adjustment. When you change the bar make sure the air filter is clean, retune the saw. I‘m assuming you are running 3/8 drive on 50ga chain so when the bar wears you can have it reground to next gauge chain 58ga then go to 63ga. But as other have said weight is weight at the end of the day it matters. Oh I get back support of some kind. My opinion Stihl makes the best light weight bars, Husky’s are good, as with Oregon bars. You can get bar studs for your saw if you want run a stihl bar. I haven’t bought bar for awhile I’m assuming $140 for bar and chain. I assuming your blowing your saw out once in awhile on recoil side and cylinder etc. The saw could run a little hotter, tuning to the bar will help and keeping the air flow thru good. My opinion your 55cc will pull 28”. I ran 28” on stihl O34av 46cc saw, it little slow but hey your cutting firewood and I’m assuming you have the time.