MarkATH10W

Hi all. New owner of an ATH10W here, and I am experiencing problems right off the bat. I apologize if this is a reoccurring topic but I could not find anything to do with my issues on this subforum at all. Hoping for some advice and shared experiences regarding: 1) The CVT is slipping and surging under load. Seems to be worse when vehicle warms up. Very notificable surge/slip/stutter when going up hills when I reach 20mph, 40mph. Goes away when hill is gone and engine is not under load. CEL is triggered, but I am unable to read what code is triggered. Seems to lose power and vehicle wont accelerate very well. I am not sure it is related to the CEL, and if it triggers a "safe" mode to protect the vehicle. I did a CVT drain and refill on my way home from work today but not sure how much fluid was actually replaced (even though I had asked that they check for me). 2) What is the code reader of choice for our vehicles? I have an ELM327bluetooth+phone but connect to the ECU no matter what profile I use with the "Car Scanner ELM ODB2" app. Anyone have success with the ELM327 and another app combination? Hoping for some good news. Thank you all.