Curious.
I've had toe gaps when mounting PIC frames (which are dead straight from toe to heel), but slowly tightening the mounting screws over a couple of months pulled the gap at the toes into contact. Don't try tightening all at once or you will strip the threads.
However that might not help with surface ups-and-downs (undulations) like yours appears to have.
The sole looks thin. If it is sufficiently thick, a little smoothing of the mounting surface on a belt sander might help. That can be tricky, but some pro shops can do it.
With the current gaps, you're going to collect water that you can't dry with a towel and get problems that result from that.