How does say, a 75 flex vary between brand? Are they pretty consistent or are certain brands that feel whippier/stiffer despite the same flex rating?
Like puckpilot said, it's not consistent unfortunately. You must also consider kickpoint, such that, for example, if you push down on equivalent tiered 75 flex Bauer Vapor (which has a low kick), a 75 flex Bauer Nexus (mid kick), and a 75 flex Bauer Supreme (mid-high kick), they will all feel different based on where the stick flexes. A low kick may feel stiffer than a mid because the stick loads below your bottom hand, whereas the mid kick loads at/around your bottom hand.
In terms of brands, companies have been playing around with their kickpoints pretty regularly for years such that it's tough to really say if a particular brand is 'stiffer' than another. Plus each brand usually has 2-3 families of sticks based around different kickpoints anyways, which brings it back to my original point above.
I’ve seen Bauer offers a 70 flex Senior stick. Any other manufacturers offering something like that? I’m trying to get as close to 75 flex as possible after I cut the stick a few inches.
Yes, the Bauer SR 70 flex will be new for next season in their 2019 catalog, and only for the top-end models I believe.
This is only Bauer though.
Please provide more info on what sticks/lengths/kickpoints/amount cut etc. you've tried so far.