Hobbwying 120a settings and motor recommendation advice help needed

[Loheswaran]

I have decided to give 2wd off-road a go next year.

I already have the following electrical equipment:

1. Hobbywing 120a v2.1 speedo
2. Corally red 13.5
3. Nosram pure 13.5
4. Speed PAssion mmm 10.5 (used in my 1/12 car)

I usually make the a final in TC at HRCC on a friday, and made c finals at the BTCC in 13.5.

With that in mind I decided to get a good compeition kit - Durango dex 210 (on order).

Now my question is as follows:

1. Should I get a mod? or should I gear up and turbo my 13.5 corally (very torquey - more like a fast 10.5)
2. If I am getting a mod - which turn do I want 6.5, 7.5, or 8.5?
3. Are the 'Ultra Sportsman' Speed passion motors any good - or should I bite the bullet and get a more expensive motor
4. What firmware should I be using on my Hobbywing 120a and what settings should I run.

help me obiwan kenobi - your my only hope