Imho, your question confounds "hedonic set points" > non-existence, as any hsp > non-existence = some level above 0, therefore with a potentially or logically unbounded set, likely impossible for such a physiological metric.
The "or" is an example of a self-realizing Buddhist who perhaps does not overly value hedonic euphoria as much as "enlightenment;" again, an example of an unbounded set (0 hsp to some undefined apparent hsp limit, with "enlightenment" likely being toward the upper range of hsp..or beyond).
The third question (re hsp > 0, and hsp of Ricard >> 0) is a general and unquantified hence unqualified question, to which the answer would likely be: "Some have this 'counteraction' as >, some as balance, and some sadly not."
Have you read Emil Cioran's "The Trouble with Being Born" or "The Temptation to Exist"? This Eeyore-like questioning is somewhat coherently or brilliantly anti-natalist. Also worthwhile: "The Path of the Higher Self," "Beams from Meher Baba," and "Autobiography of a Yogi;" all three discuss such anti-natalism from the perspective of life as opportunity.