Firmness Q's - Echo & Indie comparison?

So a while back my partner and I ordered an Echo from a drop with a CT listed as a L/F -- when we got it, it was noticeably softer than our M/F Sleipnir or our L/F Terra w/ CT & SC. We've always wondered if we were sent a L/M by mistake, but never bothered to ticket because it's honestly not a bad firmness. Plus, how would we "prove" that it's the wrong firmness? Size is a lot easier to quantify than trying to send BD pics of us squeezing a dick lol.

Our Sleip is obviously a decent bit larger than our Echo so yeah, a firm Sleip and a firm Echo in the "same size" might feel somewhat different -- but our Terra, while shaped differently, is a comparable size and still definitely feels firmer than our Echo. They both have CTs so that shouldn't affect it. How would you even begin to tell whether the firmness is correct? Does anyone have a *definitely* firm L Echo that they want to post pics of themselves squeezing (with your hands, folks!!)? Slightly joking on that last Q but also slightly not lmao.

Also -- can anyone who's purchased from the Indie/etsy shops like Pleasure Forge, Exotic Erotics, Phoenixflameforge, TwinTail, StrangeBedfellas, etc maybe offer up a little firmness comparison to BD firmness? Like is their Medium pretty much comparable/on par with BD's Medium, or is it a bit softer or firmer, etc?

Thanks for any input/thoughts <3