Pull-up form check and retracting scapula

Hi!
I've got an issue, I can't retract the scapula during pull-ups and not properly during inverted rows. What should I do to be able to do that? 
 
http://www.youtube.com/watch?feature=player_embedded&v=3u-A1VTI2TU
 
Also, how is my form?
and my program?

Workout A
A1. Goblet squats 4 sets of 6
A2. Pull-ups 4 sets of 6

B1. Glute-Ham raises 3 sets of 8
B2. Ring Pushups 3 sets of 8
B3. Hanging Leg Raises 3 sets of 5-8

C. Pull-up Iso hold 1 set

Workout B
A1. Deadlifts 4 sets of 6
A2. Pike Press 4 sets of 6

B1. Split squats 3 sets of 8
B2. Inverted Rows 3 sets of 8
B3. Ab Wheel Rollouts 3 sets of 8

C. Inverted Row Iso hold 1 set

 

Alternating btw workouts, 2-3 DAW

 

 

 

PS: Sorry I might have double posted or something! Delete the other one if possible, this is the main.

I heard from Ben Bruno that one set of iso top hold on pull-ups are great for increasing the strength in the top and I'm pretty weak there, so I thought it would help me to be able to retract the scapula. 

 

What would you recommend me to do? I've got very bad knowledge with scapula exercises

Sorry, may be obvious but what do you mean with more sets, and regular tempo rows? I can't feel the squeeze at the top because I can't retract the scapulas properly... 

 

I could do scap pulls, but how often (when) and how much?