Also, I noticed that spinning percivals somehow manage to shoot the GC, but this doesn't happen often. Shouldn't their weapons be disabled? Maybe EMP everything being pulled.
I kept that in as I thought it looked good. Any unit that happens to be able to aim can fire.
My suggestion would be to keep everything the same except the speed at which units travel while pulled by the Tractor Claws. By slowing down the speed at which the Tractor Claws pull units towards the Claws themselves (time of flight if you will), you effectively reduce the DPS of the Claws while maintaining the nice interaction between the distance of enemy units to the GC and the effectiveness of the Tractor Claws.
I already slowed it down, the balance team can slow it down further in their patch @Tagada
even though some new problems have cropped up (beam/animation)
Could you send screenshots of this?