Did the flush draw play this hand right?

[WinBig]

$50 NL Hold'em on Empire. No real read on either player in this hand. I'm relatively new to NL but I've done well at both the $25 and $50 NL tables. I'm interested in the thoughts of how the flush draw played this hand on every street.

Stack sizes for the players in this hand - seat 7 was the button:
Seat 1: Villain ( $29.5 )
Seat 4: Flush Draw ( $95.42 )
Seat 6: HERO ( $165.4 )

Dealt to HERO KhKc

Villain raises [$3].
Flush Draw calls [$3].
HERO raises [$12].
Villain calls [$9].
Flush Draw calls [$9].

I assume that Flush Draw called here since he was getting 3-1 odds on a hand that could hit big with the right flop. I think my raise has represented a big pocket pair which is what I wanted. Was my preflop raise too big? Should I be happy to take the pot right then? Is this a standard call by Flush Draw?

** Dealing Flop ** [ 7d, 6d, 8c ]
Villain is all-In [$17.5]
Flush Draw calls [$17.5].
HERO is all-In [$153.4]

I thought my reraise would get FLUSH DRAW out of the pot but I guess he was priced in getting 2-1 on a hand that will hit roughly 50% of the time if he correctly assumes he has the nut flush draw of the three players in the pot. Is the all-in call correct? I have pushed all-in when first to act with a K high flush draw and two overcards but I have some folding equity in that situation.

I guess my question is should I be making calls like this to increase my win rate? Risking $66 to win $218 with a 50% chance of winning seems like the right move. Thoughts?

Villain shows [ Ks, Ah ] a pair of eights.
Flush Draw shows [ Jd, Qd ] a flush, queen high.
HERO shows [ Kh, Kc ] two pairs, kings and eights.