Pastiliere really is a pussy in keeping here fruit.
Do anything you can to make all parameters to be quite stable.
No excess heat, no drought, constant nutrients, constant water.
A wall may give excess heat but keep temps mild in wet cold weather periods.
One has to achieve some feeling for this variety to keep it right, BUT
If this variety keeps its fruit and they ripen then they are PERFECT and all the pain in the ass of former seasons is forgotten at once.