either the checkvalves are stuck, or installed backwards as stated, or the bubble counters arent sealing tight...
there is more than enough co2 pressure to push the water out of your checkvalves if properly functioning.
The low pressure on your regulator should be around 15-20 PSI if the gauge is broken, replace it, because you are just guessing... dont guess, know what you are doing. That gauge could say 20 PSI and only be 5 PSI in reality.
You could try to slowly adjust the pressure up and see what happens, but I think YOU need to replace that gauge.
What size is the co2 tank you are using, and what is the tank pressure?
there is more than enough co2 pressure to push the water out of your checkvalves if properly functioning.
The low pressure on your regulator should be around 15-20 PSI if the gauge is broken, replace it, because you are just guessing... dont guess, know what you are doing. That gauge could say 20 PSI and only be 5 PSI in reality.
You could try to slowly adjust the pressure up and see what happens, but I think YOU need to replace that gauge.
What size is the co2 tank you are using, and what is the tank pressure?