The upgrade should not have any effect on hum, so I'd look at the cables and their connections first. Especially the ground (outside) of the RCA plugs.
I'm assuming you mean there are noises; microphonics usually refers just to vibration of the tube internal elements, unrelated to the turntable or CD player.
If you are getting noises when you touch the turntable, it may be that the turntable ground wire is not connected properly. Or it may be that the connection in the Foreplay between chassis ground and signal ground is broken (you did do that mod, years ago, right?!)