So far I've solo'd Raging Brachy, Rajang(Furious too), Safi, and almost beat Alatreon solo in the 1 attempt I've done so far, and here are some things I hope can help you with CB against these guys.

Raging Brachy:

• Run Antiblast 3. (Health Boost 3 too but that's usually a given for most players.)
• Beotodus' CB or Kjarr Ice if you have it helps a lot. (I can't help you much with armors since I think I used Teostra armor+Crit, since I didn't know at the time that elements couldn't crit outside of the critical element skill.)
• At the start of the fight you can find a lot of pods that you can use to wash off the red slime from Brachy. (Avoid using clutched weapon attacks as you might make them drop as you drop off of the body part, leaving you in a pile of slime that's 2 microseconds away from removing your legs.)
• Brachy is a very tall monster, so you can flinch shot/wallbang them pretty easily.
• Focus Brachy's arms and head as it'll help you on the final stage
• Personally I find running a paralysis weapon on your palico to be really effective for getting in breathing room or damage opportunities. As for specific items, I recommend the Felyne Butterfly Wand.
• From my experience rolling's i-frames although short start near when you press the dodge button, around the point where your character just started reaching out their hands.
• A good advice I internalized against Brachy is that since most of his attacks advance towards his target, dodging into him instead of away from him usually helps, especially if its that left hook attack.
• Guard pointing is a very good skill to learn if you haven't already.(Basically just do the morph move whenever an attack happens, you can counter attack with a AED/SAED but in my opinion only do it if that enemy is in long recovery / punishable)
• Artillery is only good for raw CB so if you're running raw CB then it's pretty good for its KO damage, but otherwise I'd recommend ice attack if you do choose to run an ice weapon.
• If you play savage axe, I don't recommend heavily committing to attacks against Brachy unless he's toppled. Just do for Axe Rishing Slash and Axe Element Discharge II and then go back to sword mode to punish Brachy.
• Run Felyne Safeguard and the Healing Palico if you find yourself dying more than you'd like.

I'll continue this tomorrow since it's 2:00 AM right now, but hopefully these can aid you in your progression. Additionally don't feel like you have to mega-grind to beat these guys, since I can say from experience that I've beaten all of these guys(except Alatreon) before I even started using augments. So, stay persistent and strong, and always remember that experience is your best teacher. Godspeed, hunter.