Breaking-in period ZX636R

According to the manufacturer's specification and the info given to me from the dealer, I am supposed to keep my new 636 under 4500 revs for the first 1000km, which I have to say is not easy
When riding the bike on the M4 on Friday, I had to stay at 80km in 6th gear just to keep the revs down.
Cath - and others who have recently bought a new bike - is it vital to stick to the rev limitation, or can I push it a bit more?

When riding the bike on the M4 on Friday, I had to stay at 80km in 6th gear just to keep the revs down.
Cath - and others who have recently bought a new bike - is it vital to stick to the rev limitation, or can I push it a bit more?