I spent about 4 months exploring custom molds for my Phonak Lumitys, and in the end I decided to stick with closed dome tips. I could never get the comfort part correct with Phonak custom molds. This was surprising, as I’ve always heard that Phonak custom molds are some of the best and they are good at this. YMMV
I started with hard acrylic molds, not much different than picture from OP. They hurt when I put them in, and didn’t improve over couple of days trial. Phonak re-made them with adjustments for fit, but no joy. So, we next tried cShell molds. cShell were initially much better … but in the end not really good enough. I was looking for a mold that I could pop in and wear all day without thinking about it. I could do that pretty well with right ear, but could only go for 6-7hrs with left. Audiologist was able to carefully grind (polish?) further and that helped a bit more, but I could never get to the “put in and forget” stage as desired.
If you’re not happy with fit when you first put them on, you’ll need to pursue adjustments. I’ve found that we won’t really get used it … this isn’t the same as breaking in new shoes. Your provider should be able to modify your molds a bit, to see if pressure can be reduced and the fit improves. Or have them remade. Since these are new, I’d certainly let your provider take on adjustments, vs. trying to modify yourself, as the molds can be damaged if too aggressive with modification.
Next step for me would be to go to softer (silicone) material, but Phonak for me only offered the hard materials. Closed dome tips are comfortable for me, only downside is that I have to re-seat occasionally after chewing. My perception is that I can hear just as well with them, so I’m not yet motivated to pursue independent sources for additional custom mold options (custom molds from Phonak were included in my purchase price).
I’m happy with Lumity performance at this point with regular closed dome tips. But if you need custom molds to hear most effectively, then best to keep after it. Good luck!