I have played a good deal of this game, haha. Got to HR 7 over the weekend in single, the start of high rank. Got a velociprey armour set (with psychic's maximum skill, Attack Up (L!) and halve stun), and also getting tetsucabra armour to balance out having something very weak to ice. In multi bar testing it to grab low rank armour of a monster, I have only played with a friend on a couple train trips to/from uni. We got up to HR 3 this morning. =)
I've used the insect glaive the most, because it was the best weapon I had out of the three I wanted to use (it, longsword and charge blade). I do now have a decently upgraded fire longsword that can give my poison insect glaive a run for its money so I'll use that when advantageous. But the insect glaive is so fun! I got the art of getting the power ups I feel, and being able to pole vault is great too.