I find the Creambacks 65’s somewhere in the middle in tightness, but I find the cab itself matters more and the VHT Fatbottom cab I often use with it is inherently very tight. For tight speakers that work particularly well with mine it’s the 20w GB’s, JBL’s and Roger Charles/Cletrons. Even with plain jane V30’s I think it can be good (if the right cab)
For tubes I like Tungsrams in the pre, for newer stuff the Gold Lion CV4004’s aren’t bad, vintage US 12BZ7’s can also help in the slots outside V1. For powertubes Sylvania’s and some KT66’s I find also tighten. Tight pickups too. For boosts I’ve loved the Klon, Yamaha OD10M, still gotta try the TC Pre and Boss FA1
I mean really if I want a tight I amp I won’t choose the SLO, but I think I can make it work if I need to. I also haven’t tried the 30w or any BAD versions, so maybe they differ. I have a 1989 and 2014 SLO. Surprisingly it’s more receptive to tube swaps than a lot of my other amps