Watch the Texas Twist online guitar lesson by Robert Renman from Blues Booster
I tend to often use the 4 chord triad somehow while on the 4 chord, and this is no exception! It's just my style. I also used the A and B triads to create cool triplet idea, which comes from SRV. I am sure you have heard that one before! I added a Dim triad on the A7 chord, which adds a cool sound. You don't have to use the whole Dim scale, sometimes just the triad is enough. In many of these licks, you'll hear how the notes follow the chords quite closely. This is something I often like to do, but variation is good, so I also try and play some more typical pentatonic blues licks. I purposely repeat some licks more than once, just because I think is a cool thing to do now and then. It gives the listener a kind of "hook" to focus their attention on.