i got 20,000 on my first try just now im getting lower.. still need to practice i think,, but lovely experience though lol
try using level 5 Inferno or Shock area affect spells for loads of enemys near you, when yor going for a WILL flip switch use the area affect next to it inted of targeting , for meele weapon use a fast attack sword (Master Cutlass , Master Katana Ect) with 2 augment slots, i have on my master cutlass Ghoul Augment & Lucky Charm Augment,
Level 3 and 5 time spell and level 4 inferno. Start immediately with a level 3, then level 5 straight away.
Level 4 inferno then level 5 time, rinse and repeat, only stopping to do the flit switches (Used inferno for levels 1 and 2 for will flit switches). The level 3 time spell is good for when you have just hit a flit switch so that it gives you more time to cast a level 5 time spell, if that makes sense?
Oh, and i always use the Diachi for everything. Can't remember which gun i used but as long as it's quick it shouldn't matter.