7) Should I apply under the FSTP even if I have a low Express Entry CRS score?
Applying through Express Entry increases your chances of obtaining permanent residence. Even if you have a low CRS score, you get the opportunity to receive a provincial nomination if you are in the Express Entry pool. A provincial nomination will get you 600 extra CRS points and virtually guarantee you will receive a permanent residence invitation through Express Entry.
Keep in mind it is also free to create an Express Entry profile. You can create an Express Entry profile and also apply to other immigration programs as well.