Hi,
Just looked at your game.
Some observations and ideas:
Economy: build 20-25 more crystal manufactories to convert your maxed out metal to crystal income -econ tab of any com station - I would put them with the others that are already built to the left of your home command station
you have a lot of excess energy - you can turn some Mk3 power stations off until you need them (each one uses 40 crystal and 40 metal per unit of game time) - if you want, use the quick button lower center of the planet screen to turn them on and off without going to each planet
Look at the CTRLS tab
turn on auto FRD engineers at the very least
Capping that level 4 planet
the com station is not under a FF so you can kill it relatively easily with your Sieges (That may release all the enemy ships at once) A safer course of action would be to snipe one guard post at a time releasing fewer ships to deal with.
Transports: one empty as bait to pull the defenders away from the worm hole, followed by another transport with all your sieges (powered down before loading) and 2 cloakers inside
Take the assault transport out to the upper left side of the map and unload.
Cloakers will mask the transport and the powered down sieges
Select the sieges, target the com station (or the closest guard post) and power up to fire.
To avoid return fire power down the sieges and reload them into the transport.
Group move the transport and covering cloaker as required to clear the guard posts
Have fun
This is only one of many ways to deal with this system
sorry the original post was fragmented - I had an appointment to keep.