why not extend the first 2 parts to 20 minutes each, with 5 minute breaks in between, then make the final session only 10 minutes long, and leave the fuel rules as they are currently (low fuel for 1 and 2, race fuel for 3).
so even though they will want to waste fuel, they can't go 8 seconds slower per lap for 10 minutes, because there is very limited time, so they'll have to do competitive laps straight away.
it might take away from the spectacle slightly for the first 2 sectors, but the 3rd would be a climax, not an anti-climax.
but tbh, i though it was ok as it was, a bit of a lull but it slowly built to a climax at the end of sector 3, so i don't mind really.
RIP Jules, never to be forgotten. #KeepFightingMichael