Hi Alan
I fitted the lokpilot 54615 decoder , this was the only Lokpilot 21 pin version stocked at my usual outlet . I have adjusted C5 to 75 and this gives me a reasonable top speed ( cv 6 mid point set at 40 )
If you go this route then as I have done you can dim the lights as well , my CV settings : cv31=16 , cv32=0,cv262=6,cv270=6,cv278=31
Regards
Bob