Sounds so good Clay! You are following that chord progression really well! Be proud of yourself!
In order to improve overall techniques, try these check list.
1) Move your right hand a little bit wider. Move more from your elbow. Stroke starts at top of guitar body. And your down stroke should go a little more lower to end of your guitar body.
2) Do no miss your upstroke so you can pick a little bit tighter. This part is very important at slow tempo. Later... playing at faster tempo, no need to play upstroke that much.
3) Focus on above two techniques so tempo is not so important at this stage (fixing a few techniques) So you can play this song much slower tempo. I think tempo should be slower for better result. From C-7 to Bb-7... don't play chromatic chord now (keep it simple as possible)
Please watch this video 3-4 times with these important points.
So lovely to see your Musicmaster Bass Amp and hear this beautiful clean tone!
Please keep going! Plus you can practice Bb Blues (simple), F Blues, Eb Blues... and Bb Jazz Blues etc.
Tomo