Betting flush draws into a field OOP

[shant]

I figured these for standard bets, but I'd like to better understand why. If you agree that these are standard bets, could you explain with math, EV analysis, pro and cons, etc.

In both hands you can assume that you have a mix of tight and loosish players, with nothing wild concerning aggression or passivity. Sort of the normal mix of opponents you'd expect to have at a table.

Hand 1: MP1, MP2, MP3 and the CO limp, the Button and SB fold, and I check in the BB with J[img]/images/graemlins/heart.gif[/img]6[img]/images/graemlins/heart.gif[/img].

Flop: (5.50 SB) 7[img]/images/graemlins/heart.gif[/img]5[img]/images/graemlins/heart.gif[/img]Q[img]/images/graemlins/club.gif[/img] <font color="blue">(5 players)</font>
I bet

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Hand 2: EP limp, LP limp, SB completes, I check in BB with 4[img]/images/graemlins/diamond.gif[/img]8[img]/images/graemlins/diamond.gif[/img].

Flop: (4 SB) 3[img]/images/graemlins/diamond.gif[/img]5[img]/images/graemlins/diamond.gif[/img]9[img]/images/graemlins/club.gif[/img] <font color="blue">(4 players)</font>
SB checks, I bet

Is this the ideal line?