Yoda was winning? Hardly 😂 Yoda was looking all nice and pretty with his jumping and spinning, but it wasn't effective in the least 😖
Dooku knew Yoda was stalling him enough for reinforcements, so he used intelligence. If Yoda had any brains, he'd have hurled the falling machinery into Dooku's ship as opposed to merely moving it aside.
I'd believe you...but this could have brought an end to the Clone Wars if Dooku was captured or killed, and Yoda knew that much. With that as your motive, why wouldn't you try and make it a quick and clean kill? Jedi don't "not try", as you've no doubt seen by now.
"Do, or do not, there is no try", a wise green guy once said. It's clear Yoda didn't.