I still haven't reviewed what you want or need, but forget "signal" diodes (IN4148 etc).
You need the IN4004 or 1N5404 (1A & 3A respectively) for carrying current.
A 30A relay is usually specified as over 100,000 operations.
Not sure what you mean by not burning coil wiring.... The relay coils won't burn with 12V.... but as I wrote, I need to re-read the lot.