the owner of these Drones must sacrifice a good deal of their carrier's potential DPS in order to utilize them, and so they need to remain effective [...]They should be easier to counter, as you'll have more time to react to their effects.
It looks like a nice contradiction to me. It can't be effective and easily resisted at the same time. If it's easy to resist then it's easy to get rid of it and it's not effective at all.
These changes give me the feeling that the drones will only affect bad players only, those who don't know how to easily get rid of the drones, which means insignificant targets in a pvp situation. Power drain abilities should be able to remain effective against good and skilled opponents, othersiwe they have no use at all, and it should be even more effective since the carrier sacrifices 80% of its dps.
Again, the major issue with science abilities is that most of them are easy to counter, which leads to completely uneffective powers except on bad players, and you're about to do this mistake again with the siphon drones.