Hi Cirillo,
I must admit that your biggest mistake was to plant it so late in the season and as such the roots have not had a chance to firmly penetrate into the ground. Roll out lawn is sliced way to thin and as such the lawn has to struggle to survive and then try to replenish itself, something its not going to do in March. It really should've been planted in November.
The lawn farms slice it so short for a number of reasons,
1, good root system left in their ground so they just top dress and in 12 months they have another lawn to slice out.
2, Less weight per roll and more lawn on the transporting trucks per load.
One other thing I'm seeing is that your lawn will spend way too much time in the shade and won't be in full sun until mid summer and from there onwards it's all downhill again for the season.
Cheers,
BB.
