Reading this thread, I don't think there is anything wrong with your chain.
Even with the revised chain and tensioner its possible to experience a brief chain rattle on start or more seriously a loud machine gun clatter
I've witnessed this on many occasions on 2 engines one 2011 with the revised kit, and another late 2013.
Two reasons behind this
1) A brief (<2 secs) rattle at startup is possible because although the hydraulic tensioner is extended with oil pressure, there is also a ratchet mechanism incorporated. This is stepped, so its possible for it to slip back up to one step when stood, slightly loosening the guides. On earlier revisions, this ratchet was quite weak and could slip back or even strip completely and become useless. The new tensioner also extends to a longer length than the early one.
2) More seriously when the engine has turned backward or put in a situation where reverse torque has been applied. This happens for instance where the car is parked in a forward gear while facing uphill, transmitting a turning force in the reverse direction. Perhaps you put the car in gear while you changed the filter and pushed the car back a bit, it only requires the slightest movement.....
This has the effect of tightening the chain and exerting excessive force on the adjustable guide, forcing the tensioner back and simultaneously allowing the chain to go slack on the non adjustable side. This is quite a dangerous situation that could lead to chain detachment on the bottom sprocket depending on how stretched it is.
So, if you hear a really LOUD machine gun / death rattle on start up, SWITCH OFF IMMEDIATELY. Then restart and chances are all will be quiet as the chain will have engaged in the sprocket properly and oil pressure will have tensioned the adjustable side as you turned off.
There is an official method of measuring chain stretch and this involves removing the hydraulic actuator and measuring the position of the guide with a depth gauge.
However this is more about fobbing off a customer in my opinion.
A loud regular tick, rpm related is normally from the high pressure pump more audible at tick over and nothing to worry about.
Some misleading information about the oil filter, there is no non-return valve (thats in the oil pump), and the servicing drain down arrangement is a combination of the sprung wide O washer closing off the drain orifice in the oil housing, the smiley mouth in the pic below ..
There is a bypass valve built in the filter as most canister filters have, that opens to prevent loss of pressure when the filter is blocked but not relevant in this discussion.
I strongly advise against the use of the cup socket for tightening the filter as its really easy to overtighten which you will regret when it comes to removal when the O washer has swollen making it difficult to remove. Hand tight is fine.
I presume you have the correct filter, if you give us the exact part no you use I will check it is the later style.
Forget all about the carbon build up/flushing rubbish discussed earlier (unless its been totally neglected and done over 40,000 miles on the same oil) Best way to clean an engine internally is simply change the oil. (504.00 or 502.00)