I've attached a couple pics of my chain after yesterday's brief sawdust creation.
Sorry; from just the photos all I see a dull chain. The cutting edges look dull. The corners look dull. The depth gauges look high. The chain looks pretty dirty.
I don't want to sound dismissive or condescending, as it looks like you have been on A.S. for a while, but it looks like just sharpening 101 is needed.
So today I got the Grandberg out and did a rather thorough sharpening. . . . Should I just try a new chain?
Electric Granberg rotary grinder, or Granberg file guide that clamps on the bar?
Trying a new chain is a good way to diagnose a problem: if the saw still cuts poorly with a new chain, then you look at the bar, drive sprocket, etc. If the new chain solves the problem, you go back and look at the old chain to see what was 'wrong'. If you can fix it, you will just have a spare chain.
****
EXCLUSIVE WEB OFFER**** Cover postage both ways and send the chain to me (padded envelopes usually cheaper for 1 chain than flat rate boxes). I will recondition it and guarantee that it will cut better that it does now.
https://www.arboristsite.com/community/threads/philberts-chain-salvage-challenge.245369/
Looking at this pic, it would appear that the raker should be about 2/3rds the height of the cutter. Is that a good eyeball value to shoot for if I'min the field?
No. Depth gauges should be closely measured to be consistent, not eye-balled, especially if that is not working out for you. Typical value for that (.325?) narrow kerf chain is 0.025", which can be measured with a basic, $4 gauge.
(Note that
@Gypo Logger got distracted, or fell asleep while sharpening, and filed away the entire chain, rivets and all: this was all that was left when he came to. Might be OK to clamp in a hand scraper, but not much of a loop to mount on a powersaw).
Philbert