From one young guy (A&P, Comm SEL/MEL w/ 525 sic type) to another, if you want to break into corporate aviation be it 91/91K/135, you are better off sticking with one side of things. Has having an A&P helped me in my career so far, sure, but it has also slowed down my movement into a flying position as well. Having both skills sets really gears you towards a small part 91 operation best (think 1-2 turboprop or light jets) as they usually have a smaller operational budget,,, now they have someone who can do both, fly and manage the aircraft. The best advice I would give you though is network as much as you possibly can, from what i have seen and experienced, most corporate jobs outside of the fractionals tend to be had from having connections.