If I was a producer, I'd change everything. I'd most likely ruin it XD
First of all, I'd start the series on a Wednesday - With evictions taking place every Wednesday. Move nominations to Saturday.
Bring back Saturday night highlights, well maybe a live task and highlighs in one - Presented by the legend that is Davvy McCall!
Weekly shopping tasks that last 2 days (Thursday & Friday).
Prize fund task on Monday.
So Housemates get a relax day on Sunday & Tuesday. :]
I'd also say bye bye to Big Mouth.