Perfecting Bowing

My teacher wants me to practice making nice connecting bows (I tend to stop and start). I have given it a go, and frankly, I sound terrible. I think the issue is with bow pressure (not even). Today, I practiced my Gavotte (better and now at about 80BPS). The March in D (Bach) sounded more like I was torturing small furry creatures, so I gave up on it. It is such a difficult piece -- all 1s and 4s (first and fourth finger) and combinations of them in odd patterns. I am not really giving up on it, just decided I needed a break. I want to play this piece through because it does challenge my weakness -- 1st and fourth finger changes on the D and G string.