Hi manu .
Sorry because my englsh so bad The problem is my service i don't use top spin and My frust serve always 50% 46% 52% and always i play with the second serve and with that i lose many points So my caracter in servcie are 90 power ( and my power always 200 /201 /204 Km/H ) my service consistency are 100% and precesion are 90%