The back one will probably have a rimlock to contend with plus it'll be a stiffer tyre.
Lightly lube the beads with soap, rub the bar straight on the bead, avoid water. Make sure the beads are down in the well opposite the side you're doing battle with, stand on the tyre with both your feet to make sure of this. Try to take the smallest bites you can, even use a hammer gently to tap your lever right up snugly to where the tyre peels over the rim edge.
Also sprinkle a little talcum powder inside the tyre and put just a little air in the tube, just so it doesn't fold itself up inside the tyre.
Nice choice there too.

