Hey,
It has been asked many many times even when i was still staff at this place. as long i've said to people but it never got public;
TCPNoDelayMod is a modification that allow your to have the same delay as on 1.8.9 as on 1.7 in an kind of way. Which i haven't been looked for but if a big server with such of experience in PvP in Minecraft i am sure it doesn't do damage.
But still some staff needs to find it out, so we need to wait on a staff members their answer. Have fun waiting