Welcome to satellites,
You might be able to purchase a new LNb holder for your dish with a 40mm collar OR change the dish
65Mtrs of quality coaxial cable will have a loss of 20dB @ 2150Mhz (top of 'IF' band). You can install line pre-amp to compensate for such loss.
Example: Technically, we measure satellite signals in dBuV.
A 90cm dish on a strong satellite will receive approx 80dBuV. You will loose about 2dB through the motor and 2dB through connections.
80dB - 20 - 2 - 2 = 56dBuV
A receiver requires 52dB minimum so the conclusion is to fit a pre-amp esp... for weaker satellites.
Other good signal parameters are required for acceptable viewing like carrier to Noise and Bit Error ratio but for cable loss we looking at signal power dB
Just check Power Consumption of the receiver as it has to supply the motor, LNb and a pre-amp.
Benchmarked cabling such as wf100 is fine
Lots of info here
Satman