Hi there,
At 8 weeks most people don't have much of a routine at all, so I'd say you're doing really well
Variation is absolutely normal and to be expected.
In general your A times look pretty good - average at 8 weeks would be around 1h15. The times where it's more like 1h30 might be a bit long, but honestly if things are generally working I wouldn't change a lot. I don't think your first nap is too early or causing the 6am WU. Things change so much in the first few weeks that the routine will likely be competely different in a fortnight. Keep following your LOs cues and you'll do great!
With feeds overnight, you would expect LO to be able to go as long at night as during the day i.e. 3h, so I wouldn't feed if it has been less time than that, but a DF, feed at 1/2am and 4/5am is completely normal for this age. Their little tummies can only hold so much, but over the next few weeks that will probably start to extend out