Question about Intex Solar Mat

I have 2 mats for 4m3 and I easily get up to 30-35° in summer. After that, the pump has to be powerful enough for more mats (filter pumps have trouble with 2 mats as soon as the filter is nicely saturated). What is also important is the cover for the pool. I have a bubble cover + a black cover and it is very effective for spring and summer.

I have a 7m3 pool, I have 3 Solar Mat and I also have 6x15m of black pipe diameter 16mm along the fence. I manage to heat the water to 30° -33°. I let you estimate.