Park 1 makes sense for what you are doing (primarily coin shooting in old house yards). Continue to use Auto GB to set your initial GB and only go to Tracking GB if you find you are having to rebalance often (as indicated by excessive ground noise in all metal - constant unstable -9 to -7 TIDs).
I do like lowering IB to 2 from the default of 6. I personally do not think IB does anything really useful so I usually go with IB = 0 to ensure it doesn't cause target masking with nearby iron, but if the iron target density is relatively thin, then I wouldn't worry about it.
Regarding recovery speed at 6 is ok if you have a lot of non-ferrous trash for separation, but you can perhaps eek out more depth at 5. I would not go below 4 because then you will start increasing ground noise.
The key to Equinox is maximizing the signal and minimizing the noise, that means:
1. Noise Cancel
2. Get a sat auto or manual ground balance. Go to tracking only if necessary because of variable ground balance readings at the site.
3. Run sensitivity between 20 and 23 unless you can get away with a higher setting without causing chatter because of low EMI. Reduce sensitivity below 20 if necessary to reduce chatter (after noise cancel and ground balance). If you find you have to lower sensitivity below 15, consider switching to another mode such as Park 2 (noise cancel/ground balance) and see if you can keep sensitivity above 15.
4. If you can't run in Multi with sensitivity above 15, attempt to go single frequency to get chatter down (typically the higher frequencies work better).
5. Do not run with Recovery Speed too low (below 4 to push depth) because you will introduce ground noise especially in all metal unless there is absolutely no mineralization (such as pure white beach sand).
Good luck!