Most people (who install systems themselves) use the same nozzle for everything. You have done it the proper way. You always want to balance the GPM vs the time of operation. If all of the mentioned heads are on the same zone and are running at the same time over the same type of turf then everything should work.
If you bump everything up to 2 GPM, then you will be putting out less water over the same time at the 360's.
Are the brown spots under the spray of water, or near an edge of the spray? Do your heads give head to head coverage? Just to verify your output place a bunch of empty tuna cans out on your lawn (brown spots and green spots). You will visually be able to see the water that is on the turf. Turf will be very happy with 1" water per week.