Well that is certainly a distressing situation. PD is NOT supposed to be painful !!
I have a few questions for you before I can try to make suggestions. First, are you having abdominal cramps or leg cramps? and when you say you have a lot of residual renal function, can you tell me what is your GFR (usually they tell you that it is 8 or perhaps 10 or whatever, and it may be expressed as a percent or in ml per minute)? What is your inflow volume? and how much do you usually ultrafilter each night?
The obvious solution to frequent low drain alarms is to change the volume at which the machine alarms, so for instance if it is now set at an expected drain volume of 2.5 liters, changing that to 2.3 liters may avoid future alarms. But until I understand your prescription and get some more facts, I cannot help yet.
Look forward to hearing from you again soon. Sorry I am so late replying to this but I was out of the country for a while.