Difficulty with large blind areas and timing/concentration

Hi all. I recently completed my first 10-day, which was difficult with regards to some chronic pain issues and being able to sit still for 1hr. Nevertheless I endured, and came out with at least two clear lessons: 1) stronger ability to concentrate using Anapana, and 2) a path forward with my home practice.

So in my home practice (and during the 10-day course), I noticed large areas with no sensation whatsoever (mostly my right side of the body, particularly right leg, right shoulder, and entire back). There was pain in the right leg but after adjusting my pose, the pain was less, but no other sensations were able to be felt.

Problem then becomes, for a 1 hour sit, I can barely get through scanning in one direction (eg head to toes). Since Goenkaji recommends waiting up to 2 mins in areas with limited or gross (ie superficial) sensation, I easily run out of time. Moreover it's really difficult to sit for the entire hour, since a lot of time is just spent waiting for any sensation to arise. Especially when I narrow the focus (eg focusing on a 2-3 inch area rather than a larger area).

I understand and practice equanimity with these areas of my body. It is what it is. But the challenge as mentioned above is that it gets very tedious with no sensation in the same areas over and over (eg entire back), and I can only last about 40-50 minutes before I need to move or my attention fades and I give up.

Please share any thoughts or tips. (Ps when I practice yoga/pranayama the sensations become a lot stronger, but I understand that's altering the energy of my body so I want to be careful not to mix the practices at least back to back).

*Also, for people over 40 years of age, do you ever feel that sitting still for 2 hours a day is just... not good for the body? I'm used to keeping very active and have avoided sitting for long periods most of my adult life, and this new practice does feel a bit like limiting circulation and aggravating certain pain issues.