I think I've had this issue. It feels like the fat pad is not there and sometime if I put a lot of weight on the fat pad and twist it would send sharp shooting pains. I didn't want to stand on my heels at all and the pain would be worse at the end of the day. I had to wear big squishy slippers to be able to stand while cooking dinner.
I was reading the Trigger Point Therapy workbook and it got me thinking. So I spent 7 days, 45 minutes each day working mostly on my soleus and gastrocnemius (but also muscles in the front of the lower leg) with The Stick, a tennis ball and some harder objects like a metal flashlight. After I did this the pain was gone.
When I notice the pain is returning I spend some time working on my calves and lower leg.
Put the tennis ball on the ground (maybe elevate it on a book), then putting my calf on the tennis ball, cross the other leg on top for additional weight, and then either hold the pressure or do deep micro rolls. Work a very small area for a minute or two the move the ball to a new spot. Working only a very small area at a time is important.
You can do similar work with the stick. Push/pull deeply and only do micro rolls over a small section, then move to the next section. Rolling the entire length of the calf and rolling too lightly only glosses over the muscles and won't resolve the issue.
If my description doesn't make sense, search for the threads about using a tennis ball for piriformis syndrome and apply the same technique to your legs.
Further, you can get parts of the front lower leg by kneeling on a tennis ball and doing micro rolls. In this case you may need to use your arms lessen the weight.
Additionally, go get a massage from someone who does ART or Trigger Point Therapy.