When using moveable chord shapes, it is imprtant to be quickly find the correct fret at which to play each chord and also to be able to play equally well in all keys. The best way to achieve this is to memorise the names of all the notes on teh fretboard. Blues uses many different chords which may take their name from any of the six strings, so be sure to learn all of the strings equally will.
Shown below is a diagram showing all the notes up to the 12th fret where they begin to repeat.
A good way to learn all the notes is to take one string at a time. Call the "in between" notes sharps as you progress up, and flats as you go back down. The dots on your guitar are good points of reference. You can use them to help the memorising process.
Next, pick the name of a note ar random and find it as quickly as possible. When that becomes easy, move on to the next string.
Another good thing to do is to find the same note on every string. Usually a nte appears twice on each string unless it is ar the eleventh fret - exccept for guitars with 24 frets.
One last way to learn the ntoes is to go across each fret. Again use sharps as you go higher in pitch and flats as you go down.