Speech in Noise is completely different program than Spheric Speech in Noise program.
The former uses the traditional ways to manage speech in noise: traditional digital noise cancelling and directionality. The Spheric involves AI denoising and possibly directionality depending on Target and myPhonak app settings.
In Spheric there can be 2-5 dB SNR improvement compared to traditional Speech in Noise, which is huge difference.
I think it’s worth to try more occluded coupling - first power domes and finally - SlimTips/cShells/earmolds deeply placed in ear canal with proper vent diameter.
There is thread about MUCH improvement after getting customsl couplings, in this case - SlimTips: