I thought the tail fin clearance was a tadge small, just asking for trouble in my opinion and flying standard. especially when doing autos, pretty good at them but one of my sites is a bit gravelly.
So added a 2mm CF plate under the rear U/C bracket and longer M3 screws.
Also put some nice white skid rubbers on the rear skids I had lying around, raised the fin off the ground a bit more. and slightly more than its twin sister the E7