Welcome!
As for Shadow, I shall never reveal the "secret" you so desire. It makes you want to just figure it out, no?
But of course, I can't resist reminding you that you should always think of a way to skip over unneeded paths using spindash-jumps and homing attacks. Remeber to use Chaos Control right. With appropriate timing, CC is your best friend in any Shadow TA.
Good luck, have fun, and show me what you've got.