long story short anthony, i wouldn't fish that area. it is really tough to feel the take of a carp with a fly. they just don't hang onto them. i've seen a carp inhale and exhale the fly in one puff of his gills. i generally fish only to fish i can see. as for retrieve, i catch most of my fish when the fly sinks to the bottom withing 4-8inches of the carp's mouth. when it touches down they usually flare their gills/pounce forward and take the fly. if i have to retrieve, i hop the fly along the bottom in small strips.

i know you are catching fish, so you must be doing it right!