The usual response will be never allow Thrust to fall below 50% of level with the eventual spec of thrust to be 50.

Most thrust infiltrators work toward a final spec of the following:

Thrust: 50
CS: 39 or 44 (Most say going to 44 doesn't help much)
Stealth: 35
Envenom: 35
DW: What ever is left

But, with Frontiers coming out and the planned RA overhaul and the expected class adjustments which will likely accompany it, your guess is as good as any.

I would suggest to not let your DW fall too low. It does give you a better chance to hit with both hands.

Hasen WhimperingCorpse
Infiltrator, Spy, Assassin
Fellowship of Valor - Pellinor