They dont lose enough damage past their effective range. Making them just a better alternative to pulsars since they only take 1 extra energy, and on tanks you typically have 2 to 3 energy spare. Increasing the damage falloff means that pulsars aren't overshadowed by the new weapons while still keeping everything balanced.
#New weapons need a tad more damage falloff over range.
rustic osprey
Maybe also a slightly longer reload
Other then damage falloff and reload they seem fine
dire sky
3Pulsar can use a full-tank build(130k+) with nanite repair while 3Nucleon need to sacrifice some HP. And nucleon's projectile speed is lower. Nucleon is better than Pulsar in other respects.
fathom bridge