Pickling Lime is Calcium Hydroxide, which is CH for short, not HC !
As to your first morn urine of 7.4-8.0 pH, this may be ok depending upon what is causing it to read this ?
"IF" you have more Energy and are not Constipated, then you may be doing fine with that pH !
But, "IF" you start to have Constipation problems, then just up the amount of Epsom Salt a little and you may continue to be fine !
As to the sauna and cold shower, all you need to do after being in a hot sauna may be to be in the cold shower just long enough to take the excessive Heat out of your body, in order to Cause the Protein Isotope to change from Acidic from the Heat of the Hot sauna to Alklaine from the Cold shower!