I have never had the bottle pressure to high in the summer, the bottle heater gets HOT!...The summer you usually do not need the heater, but don't worry you are safe..
The bottle prressure is 950 std. 1200 is max. The bottle is rated safe to 1800psi, which the blow rating on the bottle is twice that at 3600PSI. and there is a blow pff cap that lets go at 3,000 built into every bottle. I have never seen the bottle in my car above 1050 due to ambient heat.
I run a .055 gap with the screamin demon coil pack and SD wires and have no issues with a 50 shot. The stock coil is also quite good.
Speed is only a matter of money; how fast do you want to go?