Surety is a DIY Alarm.com service provider. We do not send technicians to homes, all maintenance is performed by the owner. There are installation companies that may be able to help.
I can help with instructions and recommendations.
From your previous image, it looks like the back plate can be moved up a half inch or so and be mounted higher. That would give some slack on the wires and may alleviate issues with the backplate. Then connect the back plate by both a top and bottom set screw. Looks like only the top one is currently used. Any improvement in power application?