Agree with Diver0001, although I would recommend you wear 1-2 kilos to account for tank at the end of the dive.
In most cases, you wont need any weight to account for negative bouyance in a steel tank.
General rule of thumb is take your proper weighting with an aluminum 80 in similar water and subtract 4 to 6 lbs for a steel tank and thats a great place to start.
I a very similar build, use no weight with a shortie, 2 -4 lbs in a 3mm and 4 - 8lbs in a 7mm with steel 110cuft.