Make Tryndamere more like a barbarian warrior with a huge sword and less of a saboteur or bandit
Slower moving, slower hitting, a wider array of defensive tools and a bigger sword. I don't believe skirmishers have to all feel like agile little ninjas, its time we think about what a slammin skirmisher can be.
When Tryndamere attacks 2.5 times a second it kind of destroys the illusion that the sword he's always dragging behind him is heavy or unwieldy.
And watching Tryndamere split push all day and then scurrying off when some heat is coming his way doesn't feel right. It makes him feel like a bandit who wants to vandalize your benches, lightpoles, trees, public spaces, libraries, your yard and your towers, not a barbarian who wants to be surrounded in violence.
325 move speed, 1.25 attack speed cap, replace mocking shout with a channeled block ability so he can team fight without being a binary one button champ, and double his sword size and range and make it feel big and unwieldy. Make it so that his auto attack strikes a linear area in front of him and can miss if enemies step out of it. But if it lands make it smash shit hard. Real hard. Like "I don't give a shit if you stacked armor on alistar ult this shit will fuck you up so get the hell out of the way" hard.