You had too many standing reloads. Stage 4 when you were running from the 1st shooting position to the 2nd you had plenty of time to reload on the move there and you would have had a fresh mag to get you through the rest of the stage. Same with the SG, if the COF calls for more rounds than you gun can hold (which most do), whenever you have to move from one position to the next you should be stuffing rounds in the gun.
Also like on Stage 3 instead of running 5-10 yards to the table and then dropping the mag and racking the round out of the pistol, do it while you are moving so that when you get to the table all you have to do is put the empty gun on the table.
You will pick up several seconds on each stage by doing each of these and they will add up for the duration of the match.