G'day Mike
Enyas take a very long time to run in the ring so your 25 minutes has barely started it, especially with the half throttle. I've run my new 60-IIIB for over an hour and there's barely any indication that the ring is starting to smooth the tops of the machining marks although admittedly it's only had a couple of quick bursts into a 2 stroke so far. I gave my 61 rear exhaust Enya an hour on the bench and the ring was just starting to bed in but it was good enough to fly with even though the compression "feel" hasn't settled down yet.

My running in starts with it running as rich as possible (without the plug being powered) which is generally at about 6000 revs full throttle and giving it 5 minute runs. I monitor the revs at the 5 minute mark (because it'll gain a few hundred as the tank level drops) then set the initial revs on the next full tank to match the end of the previous tank. That gives a very gradual increase in heat as the revs slowly rise from tank to tank. Enya state that it could take up to 3 hours to bed in the ring so some careful and rich flying does the final bit. One thing to note with rings is that they also need to "run in" the contact area between the bottom of the ring and the piston groove and that's where full throttle (high pressure) helps give a good seal.

The Enya 61 is a bit of a new thing to me though because, although it's ringed, the liner is brass but plated with nickel and a silicon carbide composite (apparently Nikasil!). How this might affect the running in of the liner I can only guess .