I feel like Mundo needs help

I'm sure this topic has been brought up before, so if it's something you've read through, I apologize.

In my opinion, Mundo needs a buff to his ultimate. The problem stems from how easily obtainable grevious wounds his in league. Every adc can build it effectively, (almost) every mage builds it as their first item, and taking ignite into a Mundo is necessary.

The issue that presents itself with Mundo is the thought of how/when to use his ultimate to bring about the best results. If a Mundo uses his ult early and engages with the healing, ignite is applied right away and he blows up. Likewise, if he wants until he's low to use it, grevious wounds is already applied through morello, and the healing is massively cut.

The only time his ult becomes useful is when he's out of combat and uses it to regen, but that wastes the only movement speed available to him.

What I see as the overall issue is that unlike most self healers (vlad and swain) his healing comes with no damage. It's ONLY used for healing and movement speed. With that said, having grevious wounds almost entirely stop the healing, a stat so easily obtained, is really damaging on Mundo.

What I suggest, lower the overall healing from his ult by a certain percentage, then give him resistance to grevious wounds, only while his ultimate is activated.