When you say drops, I'm guessing you're referring to ~22 on the gauge/logworks? Does the gauge display fine w/o your logging setup connected? Did you free air correctly? Did you check your fuel type in the LM programmer? I'd get it working on the gauge correct first before venturing into logging.
I've dicked with mine for many hours matching baud rates to cables and beyond. I can get it to work in romraider but it is a fussy little bitch, I have yet to come up with a system to replicate to get it working first try.