I've gone through a few bags of Redline over the past couple years and agree it is on the light side. If you're in Chicago it's a pretty great value for solid beans especially relative to many of the other local roasters and shops. I've caught <2wk old roast dates even at some big chain local grocery stores a few times for like $12.

Pretty cool that you got a friendly and candid response.

I'm usually using a naked triple basket, maybe 23-25g dose with say 25-35g out (triple ristretto-ish? which I may be cursed at for by some around here ), and i liked these beans so they probably do suit this style relative to a more classic double.

To the OP, I experienced somewhat similar variation with Metropolis Redline ~ 1/2 decade ago. The owner replied in that thread. It seems you have experienced their good customer service too with their email reply. I would second ilVecchio's final recommendations in his post #5.
Questions for long time Metropolis Redline drinkers

I can echo most of the sentiments here, I had thought it must have been my grinder drifting around on me until I brought in different beans. I gave up on it while ago. My very first bag was amazing, and the next two times seemed to be lighter and pull watery. This was over the course of a year probably, and was over a year ago.

This thread is making me wish Metropolis would offer something like Intelligentsia Coffee does: Black Cat and Black Cat Analog (with the latter usually not so "third wave-ish"). The old fart (in spirit)/traditionalist in me would appreciate the choice.

That being said, I did enjoy the Redline at their Granville (by Loyola University Chicago) location when I met up with friend there last month. It was pulled on pump machine (I forgot LaMarzocco 3 group vs. Synesso 3 group) with Mazzer (?Robur vs Major) grinders. Like OP, I too find Redline too watery when pulled using my manual lever (even higher pressure >9bar) and using 68mm conical burr grinder and brew ratios>60%.

Glad we as espresso customers have vast # of choices for great roasters.

Assuming we have some chicago-area representation here. If you aren't using Redline, what local beans are everyone using?

I recently bought some Greenline (the unroasted version) as well as the pre-roasted Redline from Metropolis. I agree that the Redline is/was roasted so light that I couldn't drink it. With the Greenline home roasted to FC+ the results are much better IMO. More along the lines of what I remember Black Cat tasting like a ways back.