Those power levels are not low, they are fine.
Downstream: no lower than -6dBmV and no higher than 10dBmV - Close to 0 is optimal. SNR >33
Upstream: no lower than 31dBmV and no higher than 50dBmV - 44dBmV -46dBmV is optimal.
Tudor
There are 10 types of people: those who understand binary and those who don't and F people out of 10 who do not understand hexadecimal c1a2a285948293859940d9a49385a2