New Turfing Problem

Hoping someone can help me with some advice. At the beginning of June, I started a new Turfing project. I had an area of around 700 SQ M that needed renewing. I decided that I was going to scrape the top layer of Turf from half the area, and lay it upside down on top of the other as I had enough of s fall in the area to lose the old sods. In addition, I use 5 tonnes of top soil over the area for a final level. Well as we all know now, we entered an extreme dry period, which has led to my problem. With the back of the bucket, I tried to compact the upside down turf as best as I could. However, by the time I finished the area, as much as I tried, the dying sods were so hard, that levelling of the area was almost impossible. However,  with no rain some 3 weeks on, the Turfing supplier told me to lay the new Turf Sods, give it water and when we get rain, the Turf will have started to take and then you can roll with a heavy roller. Well as we know, no rain came, just heat. I watered well, but nothing like a good heavy shower. 

Today as I look at the lawn, it is nice and lush. However, even with the most recent rain, my 75kg roller, has no effect and the surface is so uneven. Cutting the grass with my Honda 45cm lawnmower is an experience, as finding the right height setting is difficult, without scoring the grass or leaving it too long.

So fellow gardeners, is it now time to take it all up, in search of that level lawn, or get some heavy rolling equipment.

Thank you to anyone who responds.

Stephen