hi all, I'm struggling with how to place these 4" recessed lights and need help!

The room is 20' 1" by 28'2" rectangle. the door into room is on the 20'1" sides. and towards the edge of the room.

The thing is there is a 30" soffit on the walls that measure 20'1", so I'm struggling figuring out if I should put my first row of 4" lights there, 4 lights evenly spaced on 20'1" wall, about 15-16" away from wall (soffit is 30") then evenly place the other lights across ceiling with 4 rows on vault, and 6 rows total?

Or is this too much light? I'm thinking 9-11 watt LED bulbs. Did some calculations and using what was available online, it says I have approx 560 sq feet, and wattage is 840. I take 840/60 = 14 down lights. So perhaps 24 is a bit excessive? But the soffit....oh that soffit. Any help?

thanks!