Hi marinco
Fished Phuket once, was not familiar with the charters there. But went out with one of the local old wooden boat a few years back ( was desperate for a fish at the time). I am sure there's a few better one's just got to look around.
With gears I can suggest what you got is fine if you after a bit of fun. They do a lot of trolling for sailfish. If you like fishing with stick bait, you do get good chance of sailfish coming close to the boat. We land one around 30-40kg. If I fish there again I will bring a 7foot rod, pe3, 4000h saltiga for stick bait. A light jiggin rod for 60-150gm jigs. We didn't do much jigging but I am there would be a few reef fish around.
Hope these help