I have now tried the BD using a Thunder Power 13.5 at Aldershot in the UK, this track;
Video dates back to the 27t brushed days so it is now a lot faster. but you can see the layout, the straight is around 50m long leading into a banked sweeper so top speed is necessary.
Just piling on top timing doesn't seem to cut it with most motors so I have been testing using 40-45 and 45-50 mid a top timing etc. which seems to go quite well.
The TP motor seemed to go better when turned up to around 25deg on it's timing.
Skiddins