Sure I understand fully Steve. As it happens Alan Munde has a great Banjo Workout DVD see link below. It is a bunch of exercises just like a keep fit workout but for your fingers. I had a hard job trying to reach certain frets with my pinkie ( Up the neck Cumberland Gap Licks ) My brain just wouldn’t allow me to move my pinkie on it’s own. Alan’s video helped me fix that issue.
A big part of coordinating finger control is to practice scales. I have to add I hated learning scales in the beginning. I thought they were a waste of time. I just wanted to learn tunes. Over time I learned that learning scales helped me with my finger dexterity and accuracy. @BanjoBen has a bunch of scale lessons on the site.
A good exercise for working that ring finger on the 4th fret is hold down the 4th string at the 3rd fret with the middle finger and hammer on the 4th fret with the ring finger. Again you will come across this lick later on in your studies. It’s a challenge that need lots of perseverance and practice.
Here is that link to Alans Website if your interested in his DVD. Be sure to tell Alan you are one of Banjo Ben’s students and that I recommended this DVD to you.
When you get on the site scroll to the bottom of the page. This is what your looking for>
THE BLUEGRASS BANJO WORKOUT DVD
In ten information-rich lessons, master teacher Alan Munde de-mystifies many right and left hand playing techniques. Work with these lessons will add to the player’s dexterity, will increase left hand stretch, solve difficult left hand fingerings, increase speed, and help with the visual organization of the fingerboard.
(93-MU-B2) $29.95
THE BLUEGRASS BANJO WORKOUT DVD
$29.95 plus shipping add to cart
https://almundesbanjocollege.com/dvds/