Welcome to A.S.!I just started sharpening my chain. Bought a file with a file guide and a "regular" depth gauge tool from my local Stihl dealer. The results from my first filing were awesome, but I also ordered one of these progressive gauges because i've read good things. I just got it today but i'm wondering if i'm trying to use it correctly.
It looks like you are positioning it correctly, from your photo and the instructions that come with the tool.
The chains you mention are 'comparable' pitch, but may have different cutter geometry due to the different manufacturers. If you are happy with the results from using your conventional, fixed offset gauge, I would keep using that for a while. The benefits of the 'progressive' depth gauge setting are associated with cutters that are worn back farther, toward the later part of their life. So you may try the progressive gauge again after that chain has seen quite a bit more use. From your description, filing the depth gauges down now, using the progressive settings, might create a very aggressive chain.
Please let us know what you find.
If you are asking about the short lines or 'crown' that extend above the depth gauge cut-out, we have been wondering too!What is the center cutout for? I
Philbet