Really nice fix. It's a very minor change but I think adding that little contour really captures the look of the car. It's really that rear glass and the "shoulder" between it and the rear wheel arch that makes EGs look so good. You did a great job fixing it.
I hate the glass in these kits - very thick and don't fit at all. I think the next EG I make will have clear styrene in place of the kit included glass. I've experimented on a Fujimi EK, making the rear glass flush mount to the body like the 1:1. In that case, I used the glass Fujimi provided and cut the rear quarter glass off the rest of it, and sanded it until it fit into the hole, flush with the body. I think it looks pretty good, but Fujimi clear plastic is much thinner than Hasagawa's.
Good luck, I want to see where this goes!