Put your purses down and hit stuff!
Max out health for rage mode, since you get the regen.
Set up for purge and melee damage bonus
NO carnage
Use a Crusader with the blade (of course)
Melee amp (now you have a reason to use them besides the puggernaut)
Dis or inc whichever.
Shield power cells (I'm sure you have lots of them also) this helps bring your already good amount of shields back up quicker.
Strong hold package, to help with shield regen and give you a little extra.
Learn to hit at a run, which can be tricky sometimes.
Purge at the begining of the round and by the time the bonus is over you should have your 2 kills, go for some mooks to get them quick. REMEMBER TO TURN IT BACK ON!
The health regen plus the shield regen make him very tanky.
If you don't have the crusader then the regar is really good.
Chuck nades if you get into a unexpected spawn or a bunch of phantoms.
Learn to play the ramps.
If things get bad, back up and with the crusader you have the range to do damage.
Most fun krogan, and most challenging.
Gold no problem, even against collectors I can still top the board with this set up. Try it, you might like it.