The easiest thing for you to do would probably be to add either a group thermometer or a temp strips to your group. This way you will always know if your group is running hot, cold, or at the right temp.
Here is a thread of many different ways people have attached digital thermometers to their Pavoni's. Adding Thermometry to a La Pavoni Europiccola
A lower cost / lower hassle version, albeit somewhat less precise, is to get a temperature sensitive sticker.https://www.espressocare.com/search?key ... ture+strip
As for some techniques on general: it is always a good idea to bleed trapped air from the boiler before your first shot. You do this by opening the steam wand and pumping the lever a few times, lifting it to just below where water would start pouring out of the group, then closing the steam wand again. This will both improve your preinfusion for that first shot and cause the heating element to kick in again.
In order to further warm up the group ypu can perform those sort of half pumps in general, even with the steam wand closed, which will cycle water between the group and boiler further warming up the group.