No!!! The absolute last thing you should do is the rejet/tune. All of the other changes may have an effect ranging from small to large on the optimum jetting so you want to make all your other changes first and then rejet. The "other changes" include any of the following that you plan to do: new or modified pipes, airbox, air filter, Glen's permanent A/F screw, and pair valve.
Yes, installation of the dimpled block off plates is part of the pair mod. This mod also involved removal of the pair valve and some associated tubing.
Then, make any other changes and buy and install Glen's permanent A/F screw. After you do these things, you rejet following the aforementioned guide to tuning using a Factory Pro jet kit.