Meanings of much experimentation in English

I have discovered, through much experimentation, that my blood can be diluted.

After much experimentation, he ascribed this phenomenon to the crystalline condition of the cylinder.

After much experimentation with bearings, it was found best to make them in halves as metal bearings are usually made.

After much experimentation, we found that rolling out the pie dough in graham cracker crumbs promotes browning and crisps the crust.

But it's a delicate balancing act to ensure that too much experimentation against key World Cup rivals doesn't leave the squad psychologically deflated.