Hi!
Yohan said it right. Bottom pair is generally the hand to go into you bluff-inducing part so that it makes this range a bit stronger.
It really is the question how you play this flop though. If you have a flop raising range, then I would definatelly do it with 9x+,draws(mostly gutshots and SDs).
But since you wont raise 100% of your continuing range you should also have a calling range. This will include Ax,some Kx,prolly some FDs, so this range is generally pretty weak since there are not many Ax due to preflop and FDs are often raised on the flop. So you will call here when pretty weak,which makes 5x a pretty good add-on to make this range stronger.
If you callF/raise T with Qx+ then it makes sense to call 100% of that you want to continue with....therefore 5x is again not good to raise.
Also raising bottom pair is problematic since its not clear what it want to accomplish. You clearly are not bluffing, and if you raise for value then I doubt you really have 3 streets of it....and when you dont its often better to let him bluff. Its also problematic when you encounter further action since on this drawheavy booard there are so many possible worse hands he can do that with.