I prefer the Organic Stevia Glycerite (comes in VG) when sweetening fruits. My experience is that if I use other sweeteners (EM et al) I substitute at 1-2% for the Organic Stevia Glycerite. It depends on how sweet you like it. Pomegranate is Tart and even with max VG I found it was too tart, for my and my wife's palates, without sweetener.
This is a good recipe for beginner mixologists to use as a jump point for DIY using single flavor TFA flavors. The single flavor recommendation for Pomegranate is 7.5%-14% so you are right near the middle. Organic PYURE Stevia could be substituted at the same percentage. The flavor % can be slightly increased but this is a great mellow SF mix.