I currently use the Sphere I90 that I purchased from ZIP. I switched from Signia Insios that I also purchased from Zip. The Insios did well with static background noise but could not handle dynamic noise like the Sphere. Based upon your audiogram I would strongly encourage you to opt for custom ear molds rather than standard. This will give you the amplification that you require without feedback issues. Based upon my experience, I think you will also experience much less occlusion.
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