I have the intention to run a build with the JM-5K and the YV-666 when the wave 8 will be in store and I'm starting to thnik for builds I could use for fun and for tournaments. Here's an idea I had:
JM-5K - Dengar (33) :
YV-666 - Trandoshan Slaver (26) :
Y-Wing - Syndicate Thug (18) :
Please c&c 
YV-666 - Trandoshan Slaver (26) :
- Zuckuss (1)
- 4-LOM (1)
- K4 Security Droid (1)
This I like, Latts would be a tad more gimmicky. Spend your K4 target lock to reduce the agility by 1, take all the stress to force your opponent to reroll all favorable results, and take an ion token to disable whichever token may benefit them more.
As far as your list goes it seems potentially agreeable, the real issue is going to come down to only 2 attack dice on Dengar and locking the syndicate thug into never attacking out of arc. Having the 360 TLT would be far more beneficial to your list than attack 3 times per round with your y-wing if you get someone in your firing arc. The BTL title is best reserved for Rebel R3-A2 builds for double stress...
JumpMaster needs Torps or the title. Not both, but one or the other. How else you make explosions?
Here's how I'd hunt a bounty, using the Jumpmaster, a YV-666, Dengar, 4-L0M and Zuckuss.
And here's a list using your original ships, for those moments when 5x Bounty Hunters just FEELS right:
I love your build with the bounty hunters! Very original and can be competitive! I can't wait to try it!
This is not unlike my Lowest of the Low list, although I've just used the cards from the Jumpmaster and not the actual ship since I fear and mistrust how I will handle an asymmetric dial, and fancy my chances with the Firespray more. I went around the houses discussing the best way to get bang for buck out of the Boba crew in this thread here.