The Extra Turning FEAT (that gives +4 turns/rest) is not recognized by the endless turning enhancement.

I have 8 turns (from charisma + enhancement) + 4 turns (from the extra turning FEAT) for a total of 12 when rested and the Endless Turning enhancement (3). Endless Turning only regenerates up to 8 turns, then stops. It seems that the additional 4 from the feat are not taken into account when checking for regeneration by the enhancement.

I don't think that is WAI as the old Radiant Servant enhancement and the US destiny did take them into account.