Looking for advice on improving my ship im lvl 56 and started to be more pvp based around lvl 48 so my ship isnt all that good but would like any comments on ways to make it better. Thanks in advance.

Size- 158/160
Attack-989
Defense-65
Scan-6
Cloak-5
Cargo-150
Hull-663
Shield-110

170 Engineers
135 T.O
60 Helmsmen
63 Scientist

Weapons- Heavy Quantum Devastator x3, Dominion Cannon MK II x2
Hull- Nanosphere plating, Protean Armor

All other modules are from mission completeion awards

im producing 251 minerals a hour
402 arti per hour
285 research per hour

My mining is low but ive done well on the GTC and currently have 5.6 billion credits with a upkeep of only 3.7 mil a day

Couple of quick things -
DONT but anymore Dom Cannons Mk2, they aren't worth it. Save up your reds and go straight to Mk3 and autoblasters.
Don't worry about minerals yet, sell artis like you have or get a high rank in your legion to help you.
Increase your arti production, this should be your number one priority.
All rank points to TO's or Engineers (looks like you might be already doing that)
If you can, try get your scan to 51, then you'll start getting the good NPC's occasionally.
If you're going SSB fine, if not, add some decks and get some more hull (and that scan)

thanks phil i do need better NPC i hear you can get good modules from them

Yep, the NPC's you are trying to get with the scan of >50 are Troop Carriers (Terraforming device), Blade Harvester (Toxic Purifier) and Rogue Lab Pod (Planet Data Optimizer). You won't see them often yet, but each one is important to increasing your production and improving your ship.

There are also good artis from other Elites and Bosses, but you probably aren't seeing those yet.