I thought to split all data in small packets (6packets9char) because i read that small packets improve stability but if it could be better i could pack them in (2packets27char)
Yes, i'm sorry because i didn't explained it better but, as mentioned, I took some decision (also to use Mesh library) without knowing exactly the hardware limitation of that module. When i wrote the first post I didn't know that 5ms for a packet transmission is little for that hardware.