Last time out saw the team bring the first round of upgrades to Miami, with more planned to arrive on W15 in a busy few weeks.
This weekend starts a run of six races in eight weeks, and both Lewis and George have been impressed with the efforts of those back at the Brackley and Brixworth factories to bring the developments to the car.
Lewis said: “The energy in the team is amazing. They are so resilient, even though they have been knocked down several times they continue to keep pushing.
“There is a long way to go, but I am excited for the developments that are coming. It is always a fun process to try out different things to see what works and what does not.
“We had a step at the last race, a step at this race, and more to come in the pipeline.”
George added: “It’s been impressive to see how the team have come together, putting in so many hours to bring the developments and make the car quicker.
“The morale or motivation has not dipped at all. Everyone is motivated to bring us back to the top.”