yes 400 laps is a lot esp as you are new to honing (ie maybe not all of the 400 laps where good laps, a couple of duff passes here and there would be counter productive for sure, as is the jump from 3k-10k stone thats a big jump for sure,)

Do you have a Jewellers loupe?? they are cheap and very quick to use to check the edge while honing.

Where are you in the UK?

I am Merseyside based, if you are local or want to travel you are welcome to come over for some pointers etc.....