Deep core is for Mercoxit. I don't think you will be needing those

I think I use strip miner II's. With crystals.
The issue is unless you have the correct crystals in for the ore you are mining, you will get a better yeild with plain old Strip miner I's.
So for the best yeild get a Hulk with strip miner II's and use the correct tech II crystals for what you are mining.
Tech I crystals are slightly lesss effective.
Then strip miner I's
Then strip miners II's with the incorrect or the wrong crystals.
Hopefully that helps.