1. Coluracetam at the right dosage.

2. Linear phase eq to roll off lower frequencies. Only linear phase. Most people dont use linear phase to roll off lower frequencies. Thats a mistake. Always use linear phase. LinEQ Lowband is awesome for this. Better than pro-q2 in my opinion.
3. Always Eq before compression. The compression smears the effects of the eq in a good way. Not really a secret but worth mentioning.
4. Music theory is more important than you think.
5. Roll off the lower frequencies before hitting the signal with tape. You want the tape to hit the higher frequencies to tame the treble transients.
6. Gate the Reverb.
PS. Nothing is secret. Everything you need is out there in the interwebs