On my FS I have 711mm Easton’s with a 65mm 10deg Rise stem, with a horizontal TT of 590mm, combined with a Joplin (roughly 20mm layback)
On my geared HT I have 685mm Eastons with a 90mm 0deg rise stem, with a horizontal TT of 580mm, combined with a layback Thomson post.
On my SS HT I have 660mm Race Face XC’s with a 90mm 6deg rise stem, with a 585mm horizontal TT, combined with a RF post (10-15mm of layback)
All seem just about right to to fair, although if I want to XC up the FS for marathons etc it gets a set of 685mm Eastons on a 90mm 6deg rise stem and a Easton 10mm layback post, seems to climb quicker