Suggestion for Rumble Ult

At present, I feel that Rumble's ult is not as impactful or fun to use as certain other ults. The mechanic of using it appropriately is slightly bothersome. His ult might me more interesting if it were changed into an AOE rocket drop around him around him. This would help solidify his identity as an AP tank champion.

His current ult, although interesting does not fit with his role that well. His Q is aoe short range, which allows him to harass constantly. His W is a shield and gap closer of sorts. His E allows you to harass enemies that won't get in range and catch up with them. His, ult though, does not offer that same sort of identity with in his role. Yes, it slows which can allow him and his team to catch up to enemies, but let's be honest, most of the time his ult is used at the end of fights to pick up kills, if Rumble survives. Which is the problem, People see his ap scaling and do not start him as a tank. As such he doesn't survive. By changing his ult to be closer range aoe rocket drop around him, people would more likely build him tankier so his ult would have more effect. The ult could also gain a larger effect radius has it was ranked up. It could still have the slow, but maybe a little stronger as to make it harder for enemies to get out of Rumble's reach as he harassed the with his Q and E.

The change to his ult would also be fair as it would allow him to be kited down by skilled marksmen and ranged champs without the fear of an aoe range strip.