So I'm trying to limit my decks, and I'm wondering whether the following are worth keeping:

Mylarai Plasma Lance - Size 10, Hull 60, Attack 20
Drannik Power Core - Size 10, Energy 50
BM50 Convoy Shuttle - Size 20, Defence 100, 5% Defense vs Bases
T.O. Harmonic GigaPulser - Size 5, Shield Recharge +10
Vortul Blast Phaser - Size 12, Attack 75

If they are not worth the space, please explain why and what I can replace them with.

I'm currently rank 185 with 1303 decks. All decks from this point on will be from Lazuli Parts Vaults. No Ship Bots, no Rank Points, no Rescued Prisoners.

Thanks!

Nix all of them. Korteth Blasters are good, mostly due to the Kelethor's drops. I would recommend keeping some gigapulsers, as at some point in the future they may be worth the extra shield charge.

Sell or uninstall? I can always install some mods only when I need them.

I personally sold my plasma lances, I keep the cores for ranking. Keep the Convoys because you can swap them in for base battles, keep the Gigas just because at some point in the future you may find their benefits outweigh their costs (and they aren't very large). Keep the vortuls while at a low rank, as they are smaller than Korteths and you should factor Korteths into your final ship build.

disagree here. nix the pulser as they arent the best you can get.
keep the shuttles. they are super good against bases. unequip if you need to but do not sell.
id also keep the energy mods. dont need to have space for them all the time, but you should install them before leveling.
also do not sell the plasma lance as you cannot replace it.

For the most part I agreed with this in the post above . Seeing as I'm personally using a medium ship build, there are a plethora of modules with better stats that would be installed before even the Lances. Once I reach approximately rank 1981, I'll become a baseline SSB. It would take me until rank 3000+ to get to a point where I would (personally) even possibly need the lances, and that's a fair ways off to say the least. By then they would, hopefully, make up a small portion of even my tactical officers.

Are they even worth the decks though if I'll never have more than 1.6-1.8k?