Let's see if we can develop heavy slot torpedoes instead next turn. Short term we already have super lance escorts, long term we won't use sloop chassis. Having area denial ships would be great for our kiting strategy.
We could always just refit the Cutter hulls into torpedo boats instead of more Nettles. Given our current doctrine favors long range fire and kiting the Spike Macro cannons don't fit that as well as more lance's.
It's not like a Sloop with a Heavy Thruster and a Suncannon would be bad at short range either, the Suncannon should be more potent than a Spike Cannon on an individual basis and the Heavy Thruster should be good for dealing critical damage thanks to their insane armor penetration and as the enemy gets closer it should be easier to target stuff like engines which are crucial in close range combat.
I did misremember the cost of Spike Cannons though, I thought they were 5NEP but they are actually 3NEP (probably just associated the fact that Needle Rifles cost the same as Sunblasters) so a Heavy Grav-Thruster Sloop would actually cost 2x more NEP (19NEP vs 9NEP) in terms of weapon costs and an overall ~41% increase in known costs (24NEP vs 34NEP).
Edit:
Cutter Torpedo boat example:
[] Rosaceae Class Torpedo Destroyer (4 System | 3 Weapon Batteries)
-[] 1x Suncannon (5NEP) 1 Weapon Slot
-[] 2x Heavy Torpedo Launchers (6NEP) 2 Weapon Slots
-[] 2x Aethersails 2x System Slots
-[] 1x Holo-Field 1 System Slot (3NEP)
-[] 1x Lascannon PD (12NEP) 1 System Slot (12NEP)
Total: 5+6+3+12=26NEP
Basically just swapped the 3 Spike cannons for 2 Heavy Torpedoes and 1 Suncannon (can swap the Suncannon out for a Spike). That should give us 6 torpedoes per volley.