Wouldn't a right side pass be considered the inside? That would have been my preferred method but I thought that was a big no no ?
No, not on that corner. The rule is you can pass when the bike you are passing is upright. The exit of that kink, the bikes are upright and driving out to the outside (left) edge of the track. Therefore if you time it wo that you pass them soon after the exit when they are upright, they are traveling away from you, bike is upright, and the pass is legal. If you time it before the apex, at the apex, or too close after the apex, yes, indeed that would be an inside pass. Typically, if you think about it, if you were doing and inside pass, the bike you are passing would be coming AT you. Not good, since a mistake by you could take them out, or alter their line. A well executed pass at a track day means that no one had to alter their line (or speed) for you. That, accomplished within the group's passing rules, is the goal.
That pass was clean and safe. It was not within the rules, and you could have carried more speed executing it the way that I have suggested, and it would have been safer.
By the way, B group MEANS unpredictable. Following a rider and learning how he takes a corner has very little to do with how he may take the corner the next time or the next time around. PREDICTABLE apexes and line (every apex, every lap), with a modicum of speed, combined with good decision making is an I rider. An A rider has speed, line, and is unflappable when passed close on the inside or outside.
As far as I could tell, you were riding great and you will be NESBA "I" in no time. Just don't expect a bump on the same session that you broke a rule. Many times for an eval, we will have a CR in front towing you, and a CR behind (unknown to you) watching how you deal with the traffic the CR throws at you.
One final point - the rules are the rules. They don't change as the day goes on, as the year goes on, or based on the track that you are on. As CRs, we strive to be consistent in enforcement, in teaching, and in bump evaluations. We try to have that consistency stretch nationwide so that you can go to any NESBA event anywhere in the country, and KNOW what you can expect from the "I" and "A" riders. Just remember, "B" riders by definition are not predictable.