One way of balancing this is by decreasing the work it takes to build Light frigates.
Cobalt Light Frigate
from: 20 seconds, 300 credits, 55 metal, 0 crystal, 5 fleet, 10 DPS.
to: 18 seconds, 250 credits, 45 metal, 0 crystal, 4 fleet, 9 DPS.
Disciple Vessel
from: 18 seconds, 250 credits, 40 metal, 0 crystal, 4 fleet, 8 DPS.
to: 16 seconds, 210 credits, 33 metal, 0 crystal, 3 fleet, 7 DPS.
Ravista Skirmisher
from: 28 seconds, 420 credits, 70 metal, 0 crystal, 7 fleet, 10 DPS.
to: 21 seconds, 350 credits, 58 metal, 0 crystal, 5 fleet, 10 DPS.
Here are some key points.
*TEC get the most DPS per second while these are in continuous production, with Vasari in a second and Advent not very far behind Vasari.
Those values are. TEC:.5DPS/s Vasari:.4762DPS/s Advent:.4375DPS/s
*Advent get the most DPS per fleet amount, with TEC in second and Vasari in third.
Those values are. Advent:2.333DPS/Fleet TEC:2.25DPS/Fleet Vasari:2DPS/Fleet.
*Vasari get the most health produced per second while these are in continuous production, with TEC in a second and Advent in the third.
Those values are. Vasari:54.29HP/s TEC:52.77HP/s Advent:51.5625HP/s
*Advent get the most Health per fleet amount, with TEC in second and Vasari in third.
Those values are. Advent:275HP/Fleet TEC:237.5HP/Fleet Vasari:228HP/Fleet
Advent has the worst economy, so they do have more DPS and health for less cost, but that's always been the case. TEC coming in a close seconed evened out by .04 more metal and crystal per second per asteroid, and slightly more income from planets. Vasari coming in a third with the best resource economy and a credit economy superior to the Advent, inferior to the TEC. It's still balanced.