It sounds to me like your esc settings are just a bit to strong.
I have the FM version of the 3pm and it is a bit complex to say the least. It took me at least a year of using it to be comfortable w/it and I still forget from time to time. How do you like the manual?

A bit intimidating to say the least.
I have never really played around w/the expo, but that is where I would start after checking my esc setings
1. MBX-6 T8 1900KV, RX8 ON 4S
2. MBX-5T 1520, MMM ON 5S
3. MBX-5 ONROAD CONVERSION 1515, MMM ON 5S
4. MRX-3 ON ROAD CONVERSION 1512, MMM ON 6S
5. TEN T 2650 T8, MMP ON 3S