you have the same meter as me. i have a 250k heater. your house should not be using much gas during the summer to affect the heater now. the gas tech that serviced my upgrade request was very knowledgeable and i would assume that all of them are. however it is possible that the person that did the pipe work to the heater was not as knowledgeable. also, there should be a regulator at the heater. it needs to be calibrated to the spec of the heater. need to know what size the heater is, how far from the meter to the heater, what size pipe they used from the upgrade regulator to the heater. from what i can see from your pictures, they did install the upgraded regulator. if the pipe to the heater is undersized you will have problems.