Pro 2 Doorbell - Power Level 1 but Poor voltage

..installed a new 16v 30a transformer ...power level now shows 1 (strong transformer) but voltage is 15v and showing poor red status...i ran new 18gauge wire from transformer to where mechanical chime is located. I was going to install a 24v transformer but my Carlon DH506 is only rated 16v..i realize that the fact the doorbell (wired pro 2) is supposed to see 16-24v and that is why the poor status of 15v is showing...any idea how to correct? the new transformer did allow me to turn on package alerts though