Wait til they're on one nap!!!
3h30 is a long A for a seven month old but if it's what he needs, go with it. We often had around 3h30 for first and second A with a longer morning nap and shorter afternoon one, then a bit shorter A time before bed. Looking back it may have been because LO actually needed her pm nap earlier (ie shorter second A time), but it worked ok. I guess if your LO is sleeping well at night and tends to wake from naps relatively happy, then the routine is fine.
With bottles, I would just stick with this pattern for the day:
WU & bottle
Breakfast
Nap 1
WU & bottle
Lunch
Nap 2
WU and bottle
Dinner
Bottle
Bedtime
And not worry too much about timings
. At some point in the next few months you'll drop to three bottles, probably losing one of the ones in the middle of the day.