On this subject I tend to agree with what Nanavira Thera writes at...Notes on Dhamma :: PARAMATTHA SACCA http://nanavira.xtreemhost.com/index.ph ... &Itemid=63
I also think the Venerable Nanananda's "Concept And Reality in Early Buddhist Thought"
(available through BPS) gives a much better way to understand and differentiate 'concepts' and 'reality', which is aligned with the suttas, as opposed to the scholastic Abhidhamma model, which is based on the notion of two-truths (which as your sutta quotes above point out, does not exist in such a form in Buddhavacana itself).
"Do not force others, including children, by any means whatsoever, to adopt your views, whether by authority, threat, money, propaganda, or even education." - Ven. Thich Nhat Hanh
"The uprooting of identity is seen by the noble ones as pleasurable; but this contradicts what the whole world sees." (Snp 3.12)
"To argue with a person who has renounced the use of reason is like administering medicine to the dead" - Thomas Paine