Something off about heckrum?

After playing a game versus a Heckrim with his new predator buff rune, which makes everything about what he's suppose and meant to do stronger (from speed to damage). I cant help but say this is a little to overpowered, it basically lets any heckrum turret dive with his ult and a little lethality to kill anyone he wants (Aside from juggernauts of course) and dash out or use his dash to get in under turret and then use his ult to finish them and escape all before the 15 seconds of his predator are over. during the course of an early game if Heckrum is even able to get a little bit ahead he can basically control the game from there was I was playing a fed Ezreal and his ult could LITTERALLY one shot me and my support and our mid laner from full health and go through my guardian angel to kill me again with his dash all before the cooldown expires. Maybe lower the amount of time heckrum gets from 15 seconds to 10 or even 8 as that would give more players time to see heckrum coming and not have to fear death the second they see him, or more chance to react to one staring them down under turret as that centaur is to dang fast! his top speed 10 minutes into the game (With no speed boosting items) was 750!