You're "poor"? And you have a Canon 5D Mk II?? Come on, you can't have both...

Forget about "calibrating (TTL) meter". Your first priority is to load transparency film into the camera and shoot as the meter reads the scene: leave it all to the TTL meter to start with. At the moment, you are speculating and this will generate reams and reams of conjecture, claim and counter claim (a.k.a. the countless Kodak threads). This loading of error-sensitive film is the litmus test. Don't use neg film as the latitude is too great to pick up errors, while tranny film is sensitive to +/– 0.3 stop (or 0.5 stop for those cameras that operate to that amount). When you've got that film back, all will be revealed.

Don't rely on a digital camera when comparing meter readings. Stick to using the Minolta Flashmeter. You have the right tools for the job, just need some basic fact finding and putting the film in will achieve that. If there are glaring errors, time to brush up on your multi-spot, incident and reflected meter skills.