I had one of these years ago, I remember it being a bit temperamental. I think I got it working well when I realised the fabric needed stabiliser. I used machine embroidery thread which is finer & more slippery than sewing thread, used the same in the bobbin (this was before I had an embroidery machine so I'd not heard of bobbinfil). Reduce the top tension & try with a #70 needle. I remember using an embroidery hoop to keep the fabric from bunching up.

I had to look up what the Flower Presser Foot was. It looks cool. Given it is turning the fabric, have you got the feed dogs down, also it might work better if you use smallish pieces of fabric, use a sturdy needle and not go too fast.

Hi @Abi what kind of dance costumes do you make? I have delved into the world of tutu's and other costumes but always steered clear of leotards 
BB