To a huge degree, the ability to segregate speech streams in a noisy environment relies upon one’s ability to localize them within the space. Blast damage appears to impact structures beyond the cochlea and into the auditory system more significantly than a chronic lower level noise exposure. Your speech clarity on that side is low and binaural timing and level differences are muddled. One can localize sound monaurally with spectral cues, but the weak spectral cues occur up above 2 kHz and strong ones up above 4 kHz and you’re losing ground there in the good ear. I suppose all that is just to validate your experience that your hearing loss is different than someone with a similar level of more traditional presbycusis.
Modern premium hearing aids claim to be able to provide an SNR boost of 6-9 dB, but keep in mind that this is in very specific controlled laboratory environments. A real-world value might be more like 3-5 dB. It is not uncommon for people with hearing loss to require a signal to noise ratio above 8dB, and it is not uncommon for a noisy restaurant to have negative SNRs. So at that point, yeah, it doesn’t matter how fancy your hearing aids are. Clipping a mic to your conversation partner’s collar is always going to give you the best SNR, which works for one-on-one but not so well for groups. The roger on will give you a better boost in a group but still won’t solve the worst noise environments, but at least you have control of who it is close to. Look for environmental solutions as well–do you have any control over when and where you are meeting people? Often locations for social gatherings can be a bit arbitrary and groups might be open to suggestions of a smaller restaurant or a less busy time. Can the family member with the more traditional carpetted dining room host more often than the one with the open concept hardwood great room? Sometimes this sort of thing can be really low-hanging fruit compared to eking out another quarter dB SNR with hearing aids.