Here's my input:
1 LC
&
2 Tactical formations
Add six rhinos and you have a full ship. That may not be what you want. You may want to put a Dev formation in here instead of both tacticals.
2 Devastator formations, each w/ Hunter, one w/ SC
Put the SC in one of the Tactical formations. Give these guys Rhinos for mobility, you can't garrison them because of the Hunter.
2 Terminator formations
If that's your experience, go with it.
1 Scout formation
Rhinos again, unless you garrison them.
1 Land Speeder formation
don't garrison, unless you spread them way out when facing template armed opponents.
I see a lot of weakness in your list, and the boat anchor is the landing craft. You have too many points tied up in that, and the only way I see to play it is to smash a flank on the first turn, then land the LC on the opponents blitz at the end of turn 3.
But a Thawk loaded with Devs and Assaults (Chaplain with the Assaults, Librarian with the Devs if you have the points) will be much more effective, simply because you will be hitting on 3's instead of 4's. According to percentages it works out the same, but we all know it's better to try and hit with 8 shots at 3+ instead of 12 at 4+ and another 6 at 6+
I also see a need to put a Whirlwind battery somewhere in your force. You can easily prep someone for an assault with a preliminary barrage.
I would actually suggest if you are going to use this list, put the Devs (with Rhinos) and Hunters on the LC, and use it to break a vital part of the enemy line, usually a flank. You don't want to drop the LC in the middle of the enemy line and have him perform a pincer movement on you.
Then get the LC off the board at the end of turn 1 and use it to grab or contest an objective at the end of turn 3.
Hope that helps.