They can make small changes, but it would not make a significant set-up change, and Rosberg would know about it. It really doesn't add up.
Even given that, there was no sea change in Hamilton's form versus Rosberg after Spa. Hamilton got four of the first five poles, yes, but three of them were in the wet. Then he was slower in Monaco, cocked up Austria and GB (w) and was slower in Spa (w).
If this is where the change of approach happened, it is slightly strange because Hamilton then got three poles from four, before Rosberg won the last three.
In the 7 races after Spa, it was 3-4 to Rosberg. Monza was only his second dry pole of the season.
Sod it, he won the title anyway.
Even given that, there was no sea change in Hamilton's form versus Rosberg after Spa. Hamilton got four of the first five poles, yes, but three of them were in the wet. Then he was slower in Monaco, cocked up Austria and GB (w) and was slower in Spa (w).
If this is where the change of approach happened, it is slightly strange because Hamilton then got three poles from four, before Rosberg won the last three.
In the 7 races after Spa, it was 3-4 to Rosberg. Monza was only his second dry pole of the season.
Sod it, he won the title anyway.