Nice write-up. Just to comment on a couple of points you raised:
Personal inspection:
As you noted, you need to actually
check under the covers. This is just so important.
Few family members will want to actually check on
the work that's being performed. Much too often, supervisors don't
thoroughly check, either. Creases in the skin can hide small problems that soon become big ones.
If
you don't feel comfortable performing the inspection yourself, find or
hire someone who will. It will be a great service to your loved ones.
The sores and discomfort that so often result are completely avoidable.
Also, if the staff knows that you may verify, the full level of care is
likely to improve.
Use of lotions:
Use the best cleansers and lotions you can get. Even if
your client or loved one is in a long-term care facility, you will
still want to look into this. Find out what
is being used, and if necessary, bring in samples of your favorites. Be
prepared to ask your physician directly for prescriptions for
the most appropriate products, and then make sure the caregiver or care facility
actually gets them. If a lotion is prescribed in a facility, you will
want to be sure it is kept aside for his or her use and not put with
the general supplies.
You may have to insist, but it's worth it. Of course these only work if used daily, and properly.
Bathing
should be performed at least daily, with additional follow-up bathing
as necessary. Prosducts for rinse-less bathing are available at some
pharmacies and most medical supply stores. After the bath, lotion
should be applied, and thoroughly massaged into the skin so there is no
residue. You should be checking for the possible development of sores
while doing this.
Modified versions of high-end hospital beds are available for home:

The picture to the side is a home care setup, with a highly sophistiacted mattress and control unit on a very standard bedframe. this happens to be one hihgly regarded manufacturer's mattress, but a handful of manufacturers have competing products.
This bed looks modest, but it is one piece of
equipment that can really help. This particular rolls gently on a timer, to very sophisticated settings (variable and sectioned tilt, one-side-only shifting, etc.) This also has a percussion feature for - for example - use with vent patients.
For those who can't move themselves
in the bed, make sure that when they are hospitalized or in long-term
care they have a prescription for the best possible bed. These beds are expensive
though. Unless there are pre-existing bedsores, which there shouldn't
be, it may be difficult to get reimbursement. It is still worth it to
try, and your client may find it worthwhile anyway.
You can't
buy the entire hospital-version of this bed for home, but you can get this mattress and
control unit that can be used on appropriate home bed frames. Again, it doesn't look
like much, but it can make a tremendous difference in your loved one's
comfort and well-being.
There are a number of other areas of practical application, but this is a very good start.