I almost got Bush Clover when I was searching for substitute for Twinleaf. She seems good but I don't really know actually. I guess she will work as long as you give her Slice/Blunt/Magic type and a bunch of crit buff. And a good amount of skill act obviously.
She is far from Ancient Knights but almost every girl is far from them. It doesn't meen she can't be a good DPS if you use her with the right allies. Actually, I think a lot of girl can be as good as Ancient Knights on a specific point but they just can't be as good on every aspect. Ancient Knights are above everything because they are very versatile and shines on many aspects.
I took a look to videos of that guy (thanks for sharing) and there is actually good ideas outside of spaming Bloss. It's really a hard work to make girls works perfectly supporting eachother.

I wont say Bush Clover is Sparaxis but better. She may turn better in the right team but they just don't exactly share the same role. As I said Sparaxis can be used to trick high def/medium HP enemies when Bush Clover can't. And Sparaxis is way more badass (never forget, it's a waifu game. Waifu factor is as important as combat).

Back to Bush Clover. Start with Spring Star (school) and Dusty Miller (school) and maybe Ash to cover more attributes. And someone with x1.36 skill act to add a bit more skill. Bring Bush Clover to 200% affection and full basic ampule (at least) and she may start to do the job.