pH and viscosity changes in lotion- emulsifier choice?

Does anyone who has experience with Emulgade PL68/50 and Eumulgin SG in natural emulsions have the need to decrease the pH down from around 6.3-6.5 or is that an acceptable pH for a lotion (to also allow for pH drift)?  

What are your acceptable pH levels for lotions?

When reducing the pH to 5-5.5 I notice a dramatic increase in viscosity. I know salt thickens via the anionic and it seems decreasing pH does the same.

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