There are a few other possible noise sources (that we know of): the bath panel (as you say), the wall tiles (though perhaps caused when OP hit the frame of the door) and the bedroom door, which OP ridiculously barged on his way back upstairs after opening the front door. I can't fit this trip into the timeline where he has it as there simply isn't time unless he's running around whilst on the phone to Netcare, which is not what he says (to Roux or Nel). It's interesting that the Stipps are the nearest neighbours with a direct line of clear, open space to OP's open bedroom/bathroom windows from their open bedroom balcony door and they hear a set of sounds much earlier than any other witnesses (except Christo Menelaou, who wasn't called, and who heard 3 bangs at 03:08) and yet it is their testimony that gets heavily manipulated by Roux and Masipa (e.g. the sequence is changed and Dr Stipp's most damning call to Security gets moved to 03:27:14).
Then we have Vermeuelen's testimony (and measurements) which suggests OP was on his stumps when bashing the door with the cricket bat.
I have been busy working on something else (which I brought up a long while ago, namely OP's evolving versions, the changes and discrepancies: a cause and effect analysis). It's proving very interesting and I shall complete it regardless of what happens tomorrow but it will take a while. I'm now of the opinion that my theory (for those who managed to see it) is wrong in some key points. I shall be tailoring it! It's definitely necessary to see everything as a whole and not to try to justify individual components of OP's evidence. The phone activations remain key though to triggering events.