Hi Haydn, any small change feels massive at the start but will become comfortable over time.  Let the sound be the judge and the use the #POD Point of Difference then to discern whether you are overdoing it physically.  Embrace the difference in feeling.  As you get your harmonic slurs developing using the PPC’s with a good sound and with the free feeling of singing, everything will fall into place.  
Keep experimenting with an open mind.
Cheers,
Greg