Calculations Force

I built a test rig so that I could measure electrical energy (watts) and force ⁄ pressure (kg). It gave me a practical measurement of grams ⁄ watt.
2.5 g⁄W is normal for conventional RC (2000kv motor and 7×5 prop). So 100W gives you 250g lifting.
If you are lucky and can find just the right combination of engine and propeller … 8g ⁄ W. 200W can then give 1.6 Kg lift.
Before you buy 6 engines and propellers, buy a couple of different engines and propellers, and test how effective they are.
more motors and velocity⁄maneuverability - that depends.
It depends on the weight-to-lift ratio. If your machine weighs say 2 kg and each of your 4 motors gives out 625 g of thrust (4*.625 = 2.5 kg), then you have a ratio of 2.5⁄2 = 1.25, which is not really good.
However, if your quad weighs 2 kg and each motor maxes out at 1 kg of thrust (4 kg total), then you're looking at a lift-to-weight ratio of 4:1, which means plenty of power and speed for acrobatics.