can we get some love for ap-kog'maw? concerning against change in stormraider's surge

with the changes in keystone masteries, particularly stormraider's surge, where champion get more mv from 35%->40%, as well as slow resistance of 75%, kog'maw (ap), will be useless/dead if say, Nasus flash in and q once after mid-game. ap-Kog'maw has no kit to kite as all he has is slow from "e" and rylai, or frostqueen's claim.

So, can we get some poking power back? either by reducing time for subsequent living artilery from 10s, back to 6s (or near) of mana cost, or reducing the mana cost of 50 to 20~30 while keeping 10s time frame

also, can we not nerf frostqueen's claim further? it seems problematic in ap-mid vs ap-mid game, but it acts towards incentives against ad-mid like zed who is still popular/strong, ap-item nerf, and it gives time for late-game scaling champ to have chance in this fast-paced meta.