Quick and dirty calculations show that for level 10 module stats, laser kills faster than battery only for enemies with ~20k HP (~5.5k HP for mbatt)
With solitude (level 10) buff applied, laser is only faster than batt at killing enemies with ~66k HP or more, meaning it is only worth taking lasers against dark carriers
A possibility is to apply damage modifiers (sol, wamp, fort, suspend) to ramp speed as well
For example, soli 10 with 230% damage buff will also make the laser ramp at 3.3x normal speed
This will help laser gain relevancy in soli builds against capitals