Hi Evo.
Congratulations on your choice of lawn. In my opinion, Velvetene is the best on the market.
I have had it in my backyard for 14 years and it looks as good as it did in the first year. It doesn't invade the garden beds, doesn't thatch, quite drought tolerant and recovers very well from abuse. I've just replaced my front saltene lawn with Velvetene as it was invaded by Kikuyu. I spent 4 hours screeding in preparation as per photos attached.
Now that your lawn is 8 weeks old, I would recommend a hard scalp with a cylinder mower at it's lowest setting. Mow east and west, north and south and both diagonals until you're not producing any more clippings. Fill any dips with Special Lawn Mix soil and screed with a straight edge. Hopefully the dips aren't too deep as you don't really want to be putting more than 4cm of fill in at a time. Ordinarily with a top dress I would only add a few mm.
You may need to repeat this process a few times over the next year but I'm sure things will smooth out.
All the best.

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Last edited by Bonnar_Bloke; 25/09/17 05:48 PM. Reason: Corrected Images