Better mapping and overlap edges?

Hi! Just set up my navimow i205 and it's looking great!

I tried the auto mapping but it struggled with one side of my lawn which is bordered by a hedge, then it nosedived into a flower bed and lastly wouldn't cross over paving stones embedded in the lawn.

In the end the map it created was pretty wrong so I tried manual mapping instead.

The map is much better now but I wanted to get your opinion on two things if possible:

1. It's hard to steer the robot 100% straight, so in some places I drew the border quite far from the edge or I have areas where I strayed in from the border and then back out as if avoiding an obstacle. Will the mower correct this? Or do I need to?

2. 30% of my border is flush with my patio. Is there any way to tell the mower to drive with one wheel off the lawn on those parts so it cuts right to the edge? Or do I just increase the map size in those areas?

Thanks in advance!