You shouldn’t really use the car seat on the pushchair as they are not meant for your baby to be in them for extended periods. My boy is in the flat bit facing us until he gets to around a year then I’ll change him to face the other way I think !
Never used the car seat for pushchair as they are not safe. She was in the bassinet and then Halloween was her first time in her seat bit of the pushchair and been it ever since so just over 3 months ( but she was sitting unaided at that point) so I felt it was okay to do.
We switched pretty young because our daughter had bad reflux but we have the out n about nipper which allows you to completely control how inclined it is so when she was smaller we just it just slightly on an incline because she wouldn’t tolerate a totally flat bassinet. Completely love the pram but we’re outdoorsy folk so it was importsnt to us to have something that ‘off roads’ really easily!