when i want my hand to remember a cord such as the 4th captin cord...(nice)......i just hold the cord for about 5 min.....whilst watching tv or something, it hurts a bit but your hand will learn to strech that way and always remember to get into that position.
.......
...........also try and position your elbow forward, and when you fret the note, be sure to be efficent where (within the fret) you put your finger, "centering you chords" its been called, your fingers fretting the notes nearer the neck should push to the right of the fret as you look down, the fingers closer to the body, need to sit to the left of each fret (as you look down), supprising how many people try and put there finger in the middle of the fret,.............just making it harder for yourself
........might help
Gervais on Rosa Parks "she was arrested but then that law was changed- but she didnt stop there, she started sitting in the seats saved for disabled people. unbelavable, she talked to the driver when the bus was in motion- did she have the correct change ready? - did she bollox!"