So, if I understand you correctly, you say that the Holy Spirit (God) is never-changing.  I would tend to mostly agree.  But where I think you make a mistake is the assumption that humankind should never change, that God's creation and Will is not revealed to us over time and that the Church is the path to meeting Christ at the end of time.  Your position of "T[t]he matter, form and intent for all valid sacraments is already defined, de fide, and is not changeable" foolishly implies that Christ chose a particular date at which the Church was complete and finished.  So, would you mind sharing with us the exact date that it happened?  I can't seem to find it in Scripture, or even the dogmatic writings of the Church.