In the past, growing in vermiculite was my thing. I was the only one I knew who did it, but I got fantastic results. The Ph of the vermiculite I was using was actually a little acidic when I tested an aqueous mix (Ph 6.7). But my water, was basic at a level of 7.5.
I got the feeling when i mixed the two, I was going to have a basic solution. I had to adjust my solution and it came out around 7.3. It was closest to the recommended, but it was basic enough that my female to male ratios were 3 to 1!

You really have to watch the ph if you are growing on the basic side. Its tough, but doable and you have way more females. And once they show traits, you can back the ph down to a reasonable level.