These local guides do not use down riggers, but do use live bait. The tough part about Whitney is catching live bait.
Guaranteed Guide Servicehttp://www.guaranteedguideservice.com/
My opinion would be to give Chris Richardson of http://lakelivingstonadventures.com/
Chris has guided trips on Lake Whitney and won multiple tournaments!
Lake Livingston Adventures taught me how to striper fish a few years ago, and it has paid off big time! Chris will not only put you on fish, but show you how to do it yourself!
The local guides will probably help you, but giving up their bait holes may be an issue...