I’ve got a spitfire too and I love it!
I had a tracer 2 (very plush, very fast, very cracky) and then a pitch before it (long, stable, fast, not so active on the suspension front) before getting the spitty in 26. I’ve found the spitty doesn’t feel like it has less travel, quite the opposite, seems to feel more and more comfortable and active the faster its travelling, if anything it can feel a little unwieldy at low speed.
I’ve got an XL, which at 6’3 is definitely the right size (see the pic for my saddle height even on a big one)
I converted mine to 650b after a couple of months, and was initially undecided about which I preferred, it definitely requires more effort to turn it aggressively but for “gettin’ your plough on” it’s unbeatable. The more I’ve ridden it in 650b the more I think it suits the character of the bike, very capable on fast wide open stuff
Mine is about 31lb with vengeances, stans arch ex, 34t single ring.
And I’ve never regretted not buying a rune, ridden plenty of uplift days on mine and it lends the feeling of confidence… Megavalanche entered this summer for the first time…