Have a good read...
Have good read of "Getting to Grips with Aircraft Performance"....an Airbus
publication.
V2 is not the best angle of climb or best rate of climb or best anything. It is the minimum speed by which the aircraft will achieve the required (by certification requirements) climb performance with one engine inoperative.
Again, have a read of the Airbus pub. It's a long explanation of things, but it
pretty much tells you anything and everything you needed and wanted to know about aircraft performance.
Fly safe,
PantLoad