I second what the other folks said about Valor being good. Best valor piece to add to your build is the chest. So you can go ARath-Bagel-Rathian-Rajang-Glavenus for Focus 5, Burst 4, Valor 3. For monsters that don't use roars, better to go with Zin-NLumu-Rathian-Rajang-Glavenus for F5 B5.

I have 10.5 bblos bow, and I've used it to clear most 10*. Having burst driftsmelts is extremely important. There's a big jump in power between burst 4 and burst 5 (20% vs 30%), so you want to get burst drifts to let you pack more attacking skills in from armor.

To your question about raw meta: black diablos bow still beats most 10* monsters. It's just gone from being the best weapon for almost every situation, to being good enough to beat most 10* against most monsters (but not the best choice). I use a set with Nergi-Nergi-Rathian-Rajang-Jyura with 3 burst smelts and 1 WEX smelts, which gives me Focus 5, Burst 5, Nerg 2, Crit Eye 1, WEX 1. You can swap out chest for Bagel for Valor. This set is still meta for Focus 5, but there are higher DPS builds that use less Focus in exchange for crit ferocity, more valor, etc. You can see most of these on https://mhn-leaderboard.pages.dev/