It is the driver head and loft that most influence launch angle and spin. Typically you would select a head that puts you in the correct launch angle range and spin range, after which you would fine tune with a shaft that best suits you swing. If you are hitting the ball way too low with a Black Tie, a White or Red Tie is unlikely to miraculously give you an extra 5* of launch. It should, however, marginally increase your launch angle.
Also, you mention you intend to install a bimatrix shaft, by which I assume you mean the Grafalloy Bimatrix Tour Prototype. This is not a high launching shaft so I would not expect to see a material improvement in your launch conditions over and above the Black Tie.
It's difficult to recommend you a solution without any further information. However, suffice to say only a small percentage of golfers would optimise thair launch conditions with a low spin head in 8.5* paired with the somewhat stout Black Tie. That is also true even paired with a White or Red Tie, as 8.5 is a low loft in today's world.
Most golfers benefit from a higher lofted driver, but shaft choice really does depend on your swing.
