Hi @Mojo2! With your battery remaining at 98% for 3 days and not dropping, it is likely receiving power for a trickle charge. The power supply you are using is certainly providing enough power. Keep in mind, adding more power does not equal a quicker charge as the rate of power pulled is still for a trickle charge.
The signal described looks great and number of events triggered on the device is minimal, which is a great way to maximize charge. The device is still in operation, maintaining network connection, and will usually update settings after a setup or feature change. This can all use battery power, and so if it is remaining at a level, that is a great indicator that some power is being applied.
The best results and recommend method of monitoring battery charge, is to monitor over several days and various battery levels. If you battery remains in the 90% area for awhile, this could be a good indicator that your Doorbell is receiving the necessary power to charge. I hope this helps! 