Making a vein map is one of the most important step in Gregtech when you have made your Ore processing chain. Following Bear steps, I have digged more than 50 chunk borders (to check 4 chunk at once, so almost 200 chunks checked) and only found two manganese veins, for instance (but they were enough for Tantalite, hopefully).
How does that Bear's method exactly work ? I try to dig in the center of every 3*3 chunk, which works quite well, but your method seems to check chunks quicker