Here in SE Oklahoma we don't have many trees more than 24" thick. A lot of oak, hickory and a bunch of pine. And most of the branches are 6" or under. I have a 372 and a 262 for heavier work. My old trusty wild thing died and I really miss having a lighter saw, especially since I do this full time now.
As you will find out from the thread recommended by
@SimonHS, some of us are somewhat "enthusiastic" about the "perfect limbing saw".
Based on the description of the trees that you are dealing with, and your need for lightweight, and what I sense is some experience with saws (so you have an expectation for some performance), the MS241 is power for pound, almost impossible to beat, has very good balance, and it runs a narrow-kerf blade/chain so it has to cut less wood-width which means it cuts faster than a similar powered saw with a normal blade/chain. They tend to be hard to come by as they are no longer sold in the US. Here is a recent thread from a guy who just imported one from the UK who should be able to help you out -
https://www.arboristsite.com/threads/help-me-find-nos-ms-241cm.363560/
As an aging non-professional, yet experienced wood gatherer, many years ago I settled on a rear handled MS200 with a light weight 16" bar (also narrow-kerf) to do just what I expect you used to do with your WildThing, and I am dealing with much the same size trees as you described.
I still think the MS200 rear-handle has the best combination of balance, control, power and reach for limbing of any saw I have used
for my sawing needs. (and IMO that combination is a good recipe for safe sawing for aging saw users who may not have the same strength and stamina as they used to have)
Today's version of the MS200 is the MS201, which is available in a rear-handle, and you might want to add it to your list of saws to consider. Be prepared to spend some money, as these are prof-saws and not cheap.
I suggest you further define/explain "your sawing needs" and your "experience and expectations" to this group of saw fanatics, and they will jump to help you find the right solution.
FYI, my MS200, 012AV and MSE200 all share the same bar and chain configuration so I can sharpen/swap chains at my leasure.
