Hmm, about the same length as the main straight where I go. I suppose if you don't feel it's a problem, then use the old adage 'If it isn't broken, don't fix it.'
7/8 mins is about normal to be honest. Some can get about 10 minutes at an extreme push, whilst others can barely get 6 minutes. It all depends on the engine and tuning (something we don't have to worry about, though something you never had to worry about
).
Congrats on the excellent 1st result though! Plenty more to come too I'd have thought...