I think all my track PBs (800, mile, 3/5km) came 3/4 days after a Lakeland classic. I can contest a track race 3 days after 5 hours on the hill is not enjoyable.
You’re made of stronger stuff than me! I think the last thing I’d want to do after fell racing is hit up the track... does give a nice readymade excuse though ;) How was nationals baba?
I think 3 hours in Kooyoora was a bit savage, though the volume of highly technical orienteering outweighs the slightly down track time.