Feels like this is missing something with respect to +2 perambulating move on DISCERN
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The garden has 3 phases separated by autofires. The first ends when you hit level 5 of perambulating. If you did all +4 perambulating moves that's 4 separate cards to play, with a maximum of 28 points of awakening, to wind up at 16 CP and the autofire that moves you up to level 6. If you happen to get DISCERN in the first four cards of this phase and play the +6 Awakening/+2 Perambulating option just once, you're going to wind up at 14 CP of perambulating after 4 cards and 27 points of awakening, but you still get another card before the autofire, which is going to be another chance at 7 awakening. Yes, it's another action, but depending on your cards, it's reasonably likely that you can get a significant addition of awakening in that fifth card. Even if you wind up failing a check in that action and getting skunked, it's no different than if you had chosen that card instead and failed the check in an attempt to get +7 awakening on a typical +4 perambulating card.
In the mid-phase when you go from 6 to 8 perambulating (6 + 7 + 8 = 21 CP) it's less beneficial because you're going to get a minimum of 6 cards no matter what, so you'd need two DISCERNS in that phase to get an extra card, but it is definitely possible.
In the final phase you've got 11 CP of perambulating to work through, and again, a single DISCERN gives you an extra card to play (4 total instead of 3). By this point in the maze you definitely should be able to get +7 awakening with the resulting additional card.
In short, as long as you're not playing DISCERN as the last card in a phase (or as the second to last card in the mid-phase, if you've not already played it once) then it always makes sense and will increase your EPA to play it. It does extend the carousel by 1 action, but if you're grinding for echoes it's unlikely that that's a significant cost.
Perhaps this what is intended above by the line "Using only the 6 CP awakening/2 CP perambulating option is slightly worse at 5.05 EPA." However, that was not at all clear to me.
Also, to be 100% clear, I'm talking about playing the first option on the card only, "Select a head from the pile."
