Good luck PB.
But, I think you need to be doing a little more direct ham work in that workout (i.e. SLDL's, GM's, or hamstring curls, even). Otherwise, you'll eventually create an imbalance in strength between the two groups (hell, quadriceps already has an advantage of 4 muscles versus 3 for the hamstrings) that increases your ristk of strains/tears if you're out playing a sport, running, etc.
Ideally, you should be able to leg curl 3/4 as much as leg extension to know that you have a good strength ratio between the groups. (I'm just listing those two b/c they are the most direct examples of comparable exercises, not because I think you have to do them).