For Ninja 32 vs 64, the only advantage is when you need to do very large optimizations: complex strategies, a lot of bars, multiples time frames and multiple instruments. In this case, Ninja will need a lot of memory, and only a Ninja 64 bits can manage more than 3 Gb.
So, unless you do this kind of things, using the 32 bits version will not change anything for you.

I don't know how Ninja is working with their data feed providers, and what information is given to Ninja by them, but I assume their give them some specifications and/or their API.
If TT API is not 64 bits, Ninja cannot do a lot against it...