At 10 weeks old a 3 hour EASY is totally appropriate, babies move to a 4 hour EASY around 16 weeks/ 4 months. There is a big growth spurt around 12 weeks which is one reason for sticking to the 3 hour EASY, another is that he won't be able to do the A times needed until he is around 4 months.
Is there a reason you wanted to move to 4 hours early?
The DF needs to be done between 10pm and 11pm as doing it later has been found to disturb sleep as much as help it so I wouldn't suggest moving it later really. He is doing really well to be going from a DF to 4am at this age and that feed will be dropped when he is ready to do it.
Laura