The very basic fact of the situation is that now, you have a microphone on each side of your head picking up your surroundings and by extention your voice. Regardless of what fitting you use, you will always hear a bit of your voice and probably more so than you’ve heard before.
The guys here are right you do need to explain what you hear to your audiologist and you may need to experiment with different types of couplings to your ear etc, but some of this may be you just adjusting your internal mental processes to make yourself speak a bit louder than you need to.
I for example wear custom in ear devices with a very small vent, due to my ear condition. This means my voice can sound really boomy in certain situations and especially when my hearing is bad, as it fluctuates day to day. On those days I just have to cue myself mentally that my voice is the loudest sounding thing to me, but for everyone else is quiet.
This is particularly bad for me in noisy environments. I turn on noise canceling, the noise is dialed back, but I forget to speak louder. Not everyone has noise canceling 
It is an adjustment period for sure but it’s not a Phonak issue and it is something you can definitely get used to if you have the best programming from your audiologist possible and if you keep it in mind when speaking to people.