A couple of things to consider with any hearing aid brand. What fitting algorithm is your provider using and are they using an “Experienced User” profile? Having read this forum before I got my first HA’s, I told my audi that I didn’t want any gradual accomodation: I wanted the “full experience” right away. She still fit my with the New User Resound profile, which backs off high frequencies. Why? Most folks have age-related hearing loss and compression makes soft sounds middling loud so folks with high frequency deficits now can hear soft sounds amplified loud enough to hear. So marketing studies have found most users don’t like really loud new sounds in their ears that they haven’t heard for years and the companies back off “shrill” amplification so users can be happy - lots of treble sounds “tinny,” especially when you haven’t heard it very well for years. The Experienced User (nonlinear) profile dials in more amplification at high frequencies (if I recall correctly) and NAL-NL2 and DSL5-Adult even more for the amplification of soft sounds in the high frequency range. So if you can talk your provider into it, you might tell them you want to experiment with NAL-NL2 and/or DSL5-Adult and be sure that they are using an Experienced User profile with you. Those options are in the ReSound Smart Fit fitting software and my audi says that all the other techie things in the ReSound’s HA’s will still work just the same with these different fitting profiles as the different algorithms and user experience profiles are just messing around with applied gain at each frequency for soft, medium, and loud sounds.
The other thing is that $7800 is a bit outrageous to pay for HA’s that are no longer the latest model. You could go to Costco and get the Prezas for about $2200 and they are essentially supposed to be defeatured versions of the Quattro’s - no tinnitus management, no remote assist, the HA’s are locked by Costco so you can’t play around with DIY and maybe someone else can comment on how willing a Costco fitter is to allow a user to try different fitting profiles and fitting algorithms. One can always get one’s hearing aids as I did from an online provider like Tru-Hearing where you get limited service from the fitter and then after an initial few post-fitting follow-ups, you’d have to pay a la carte but the warranty issues I’ve had have all been covered by ReSound and my audi at no charge whatsoever to me. For your $7800, you’ll probably get a lot more free trialing than from Tru-Hearing but Costco has a 180-day return period so you could try the Prezas for quite a while and perhaps try different fitting algorithms - same for other fine Costco HA’s like the KS9’s.
P.S. You might try reading some posts of user “Don” ( who disappeared from the forum around March 11th of this year - hope it didn’t have anything to do with COVID). https://forum.hearingtracker.com/u/don/summary
Don was very big on DSL5 and also having an almost occlusive fit using Select-A-Vent. Particularly if one has good low-frequency hearing, as you seem to do, noise and possibly out-of-phase normal sound coming in through a really open fit can be a problem. I think a more occlusive fit is something to experiment with and see if it works for you - especially with custom molds. One good thing about the forum - one can get better educated about all the possibilities and one’s provider might not necessarily have the energy or the motivation to explain to you all the possibilities - but it’s always good to check out any bright ideas with them - and see if they have good answers/explanations.