I am in the middle of reading quite a few encyclicals. So far, I have read “Quo Primum,” “Cum Ex Apostolatus Officio,” “In Eminenti Apostolatus Specula,” 38 of the 58 sections of “Pascendi Dominici Gregis,” “Apostolicae Curae,” “Mirari Vos,” “Quanta Cura,” and “Mediator Dei.” I have 13 to go, at least for now. When one actually reads - and studies - the Encylicals, one realizes that everything since Vatican II has been/is heresy. It is difficult to comprehend, but one must not resort to intellectual dishonesty in order to make excuses. I trust that Jesus will keep at least a remnant of the Church pure as He promised St. Peter when He gave Him the Keys.
IMO it's imprecise to speak of "a remnant of the church". The remnant IMO is the church. The larger portion are unredeemed pretenders who dwelt within the church, according to the apostle John (1 John 2:19).
“...everything since Vatican II has been/is heresy...”
I’m not there yet and I’m not a sede vancantist yet, but for many years now I have been coming to the same conclusions as you are. I fear the Church is in uncharted waters Pope does make me nervous.