Others touched on points I'm about to make but roughly what I'm hearing is:
Been a few years; fabric does wear in use as well as in storage and lose it's 'rebound' or ability to bounce back after loading.
Simplest explanation is that the fabric has broken in and opened up a bit. IE- it's a bit softer/saggier/squishier as the time passes.
Bit like that sweater or pair of jeans that fits you better the second day you wear it.
On that note- maybe a warm water hand wash will help bring a little life back to the hammock in the same way.
You changed/gained weight; same issue and/or compounded the above issue.
Solution to both- extend the ridgeline.
As mentioned, the ridgeline sets the sag but if the fabric itself is a hair longer/looser due to wear and you're a bit heavier... you need a longer ridgeline to reproduce the original sag. The rest of the stuff is fairly static, but that 11' hunk of fabric isn't.
If you have a fixed ridgeline- either splice up an adjustable ridgeline or add a small loop or carabiner to get a little more length.
Lengthen=Lift... Shorten=Soften (easy way I remember it)
So- longer ridgeline= less sag without getting too bogged down in the details.
The 83% guideline is just that; a good place to start.
As noted- double check the rest from tree to hammock for slips, twists, or problems but sounds like you've got quality components there.
Short of seeking out a shorter tree to tree distance or bringing a ladder- probably no real help there.
If you're looking at replacing the ridgeline- consider a structural adjustable ridgeline (7/64" amsteel).
This will not only give you some control in the field (or to combat that first night sag Phantom Grappler mentions with a second night adjustment) but also allow you to crank the overall system a bit tighter so you're not overly eyeballing the tension of the ridgeline itself, which is another variable you can reduce. IE you can set the ridgeline not quite string tight vs some version of looser than that you might have a hard time repeating during sporatic use.
Just watch out for going overboard with an integrated bug net.
Often a vendor will limit your range of motion so you don't accidentally blow out your net.
So if you see things getting alarmingly tight then before you ruin it you may consider selling it while it's still useful to someone else
Ultimately it may simply be time for an upgrade that better fits your current weight and needs.
If all else fails- get a bridge
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