Hello FF117, the imperfections can be cured by meticulous blade work prior to rolling. You will know for next time. Just lay the geo cloth, and get some gravel laid before heavy rain arrives.
As for the loam area, grass it. Also make sure water cannot build up speed on bare dirt as it will scour out quickly. I recommend you spread old hay on the bare loam to protect the ground from the rain(scouring/ water runnels) and also from drying out(sun and wind). This gives the best grass survival %. It is surprising how much hay spread on the ground prevents/reduces scouring in heavy rain.
As for the loam area, grass it. Also make sure water cannot build up speed on bare dirt as it will scour out quickly. I recommend you spread old hay on the bare loam to protect the ground from the rain(scouring/ water runnels) and also from drying out(sun and wind). This gives the best grass survival %. It is surprising how much hay spread on the ground prevents/reduces scouring in heavy rain.