Questions about new Evolution gadets.

Haven't had the chance to test it out the new gadgets and its interactions, so:

Does ring doubler reduce Ring Evolution of 10 rings for +1 stats to 5 rings?

Does getting rings like the 20 ring increase stats by +2 and 100 rings by +10?

Is there a cooldown for each instance of Collision Evolution when colliding with others?

Does Dark Chao, Slime, Weight, Monster Truck, and KBB give multiple instance of Damage Evolution or only 1?