Rexton Reach ix cic li 80–tulip domes?

Hello,

I have had these HAs for about 7 weeks. I’m using the Costco-supplied open domes. I’m experiencing feedback issues that remain unless I adjust the “balance” way down to -6 (soft).

I am wondering if tulip-style domes might help, but I haven’tbbeen able to find whether these are available for this C-I-C product. Seeking advice. Thanks!