Coming a long nicely, you can trim off half the larger tab on the rear (if you wish). Elastic loop is added on the rear to help keep strap down
NOTE: As seen in the photos below, there are no large tabs on the rear of the shoulder bridges. This is not specifically mentioned in the CRL, but removing them is highly recommended if possible.
As for radius of the straps, it changes person to person, give it a rough curve and check it lays flat on the backplate when worn (and glued on the front)
Most armor will allow 1 larger tab and 4 1/2 to 5 smaller tabs glued to the chest