I can not find my sources now to see why I gave 16 points to 253s, but I find here some references to a strenghtening of Series 253:
https://a2asimulations.com/store/ind...products_id=52
Of course they could be irrelevant so your suggestion of 15 could be good anyway.
The page linked above also confrirms your production data of 201 machines of Series 253.
Here I find 45 machines for Sereiues 53, in a first batch of 34 (serial 53.20 to 53.53) and then one of 11 (serial 53.54 to 53.64):
https://books.google.it/books?id=C-S...batros&f=false
170 km/h and 180 km/h are in the same speed range in our simplified system so they can share the same deck. Same for 188 km/h and 197 km/h. We made steps of 20 km/h from one arrow lenght to the next.
A is in the right speed range, but if I'd have a chance to make a deck on purpose I'd add one sideslip per side.
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