pressure is constant thru the fuel rail provided that your pump is working of course. but in B-series motors(not sure about D series) cylinder 3 receives the most air flow, not less fuel

Now back to EGT's. I'll try to put this into simple terms. first think about where an EGT probe is located. its in the exhaust somewhere, of course. so knowing this dont confuse cylinder temperatures and pressure to exhaust gas temperature, they are related to eachother but are different. if you pull ignition timing what is happening? your making the spark go off later, and in doing so youre also causing the burn/combustion to happen closer to around the same time the exhaust valves open and let the gas out. therefore there is less time in between the mixture being ignited and it traveling thru the exhaust ports of the cylinder head, the gas is going to have less time to cool since its being ignited later and the EGT's are going to show an increase in temperature. in extreme cases, commonly seen with two-step rev limiters and other ignition timing devices, the spark will be going off so late that the mixture can somtimes combust within the exhaust causing the EGTs to skyrocket with only partial load on the motor. this happens when u see cars blowing fire out the exhaust, (but too much fuel can give the same visual effect).
Increases ignition timing will do that opposite until severe detonation occurs and the actual cylinder temps begin increase drastically.
Obviously there is a lot more to this but im just trying to put it into simple terms. hope this helps a little