@dsper I think you are doing well.
You might try dialing in even less capacitance, since the tonearm cable is part of the overall capacitance that is a load on the cartridge. If its an actual tonearm cable and not a generic audio cable then it might be 60 to 100pf on its own (a generic cable might be 4-5 times that amount!). By decreasing the load capacitance by 50pf you effectively raised the resonant frequency by 3 or 4KHz. This probably puts it right outside the audio band. The further you can get it from the audio band the better- it will open up your bandwidth without increasing brightness.
You might try dialing in even less capacitance, since the tonearm cable is part of the overall capacitance that is a load on the cartridge. If its an actual tonearm cable and not a generic audio cable then it might be 60 to 100pf on its own (a generic cable might be 4-5 times that amount!). By decreasing the load capacitance by 50pf you effectively raised the resonant frequency by 3 or 4KHz. This probably puts it right outside the audio band. The further you can get it from the audio band the better- it will open up your bandwidth without increasing brightness.