Well try a batch sparge by draining 12l of first runnings to a spare bucket then add sparge water and stir. But I still suspect sparge is not the only problem as the description is not unlike my mashes and I don’t end up too far from my expected numbers.
I also find its hard to get the wort mixed well enough for a true reading as it tends to stratify.
I also find its hard to get the wort mixed well enough for a true reading as it tends to stratify.