I'd suggest getting friendly with hammers ;) It might just be me, but hammer's are my go to weapon for the swifter enemies, such as blangonga, kirin, etc...
Reason being the power slam. Relatively easy to hit these speedy blokes with it and it does a decent amount of damage, which can build up until they get knocked over. At that time, you can run up and triple pound them a time or two... Might take some practice and time, but it's fairly safe if you do it right. I usually keep the hammer away until I'm fully ready to attack, and then I unsheathe into the charge attack. Make sure not to use the spinning version, very likely to get you tagged...
It's a simple method, but it should work! Also works wonders for the crabs, which coincidentally means you can have easier access to one of the best raw hammers before g rank, ceanataur head axe! I used it until I got juggernaut, so it even has a minor place in g rank.