stud 8b - 3/6: when to bet into 3 low cards with a high hand etc.

[imported_getfunky]

often i am unsure when to bet with high against the low who has only three babies showing
- playing sixhanded and my image is tight, so i always raise or fold marginal hands - here a pretty live (44)a

i bet out on 4th in attempt to get villian#1 to raise out #2. but because of this raise the 3 that #1 got on 6th st. scared me into checking - should i have bet there with aces up? i think i should have and bet the river if he just called, and check -called if he raised me. - what if they were three suited babies showing as well as the possible low str8 - should i have still bet aces up? what if i had only a pair of aces in this exact hand- should i have bet or checked on 6th? -- another issue i have is betting unimproved pocket aces - (aa)3 into an king up -that appears to not have improved to two pair -- i often miss out on these value bets by checking unimproved aces- when is it right to check the aces?

Dealt to villian#2 [ 5h ]
Dealt to -- [ Js ]
Dealt to hero [ 4c, 4s ]
Dealt to hero [ As ]
Dealt to -- [ Jc ]
Dealt to -- [ 7s ]
Dealt to villian#1 [ Ah ]
villian#2 bring-ins (1)
-- folds.
hero completes (3)
-- folds.
-- folds.
villian#1 calls (3)
villian#2 raises (5) to 6
hero calls (3)
villian#1 calls (3)
** Dealing Fourth street **
Dealt to villian#2 [ Jh ]
Dealt to hero [ Tc ]
Dealt to villian#1 [ 2d ]
hero bets (3)
villian#1 raises (6) to 6
villian#2 calls (6)
hero calls (3)
** Dealing Fifth street **
Dealt to villian#2 [ 9c ]
Dealt to hero [ Ad ]
Dealt to villian#1 [ Ks ]
hero bets (6)
villian#1 calls (6)
villian#2 folds.
** Dealing Sixth street **
Dealt to hero [ 8h ]
Dealt to villian#1 [ 3s ]
hero checks.
villian#1 checks.
** Dealing River **
Dealt to hero [ 9d ]
hero checks. [ 4c 4s As Tc Ad 8h 9d ]
villian#1 checks.