1. What is the output on your cart?
BAT P3 card is 46db for MM and 60 db for MC. 60 db should be enough for almost anything
Are you sure that your P3 is in MC mode ?
2. Quality of P3 is not up to standalone BAT units. Not even close.
It looks like P10 definitely is out of your budget and P5 has "only" 55db gain in High position. You may try to sell P3 and find standalone phonostage that works with your cart and gives you better quality under $1000
3. I would suggest to call BAT. They are usually very helpful.
BAT P3 card is 46db for MM and 60 db for MC. 60 db should be enough for almost anything
Are you sure that your P3 is in MC mode ?
2. Quality of P3 is not up to standalone BAT units. Not even close.
It looks like P10 definitely is out of your budget and P5 has "only" 55db gain in High position. You may try to sell P3 and find standalone phonostage that works with your cart and gives you better quality under $1000
3. I would suggest to call BAT. They are usually very helpful.