Hi Ron,
So, is it wiser to use what movement capability I have to practice
more or try to strengthen my forearm and hand muscles in addition to
practicing?
Spending more time with guitar in hand will help you the most. It's not just about strength, but also about independence, coordination of LH and RH, and even eye/ear/hand coordination. It's the whole process, and dedicated hand exercises can actually do more harm than good (however, proper hand stretching exercises are extremely valuable, as are back stretching exercises for musicians).
As for "how slow is slow?" - how slow can you go without falling off the chair? Start painfully slow, and with each rep, increase the mm by 2 notches. Perhaps the next day, start one notch faster as your slowest speed, and with each rep, agaim increase by 2 notches.
As for the "one chord to the next thing", we've discussed how to get from C maj to F maj so many times now over the phone that I really din't think you had to bring it up here. :-)
best always,
Bobby
