Matching a transformer to one in a video balun - Vertical sync is off
It looks like you are transformer-coupling the video. The problem is that in order to preserve the vertical sync pulse, you need a bandwidth extending down to well below 60Hz (the field rate), otherwise you will see excessive  'tilt'. 
The PWB3010-1LB is specified with a bandwidth down to 3.5kHz (presumably in a 50\$\Omega\$ system) and this is nowhere near low enough. The way commercial video baluns are connected is like this :-



This arrangement ensures that both sides of the twisted-pair have an approximately equal impedance to ground and has a bandwidth down to dc (so there is no galvanic isolation - which may be an issue for you). The symmetrical footprint of the Coilcraft transformer means that it can be rotated through 90&deg; to configure it like this.