I believe the Evermore line is exclusively water based, so...
I'd recommend using Floetrol instead of water for the thinning - you won't sacrifice coverage ability for the thinner consistency.

(Always shake the Floetrol container vigorously before adding any of it to the paint - and always add small amounts at a time, paying attention to the maximum recommended proportions mentioned on the Floetrol container... if you add too much, you'll need more paint to balance it out - so better to under-estimate the amount of Floetrol to add, always AVOID over-estimating the amount to add.)
If you are finding that the paint is drying a bit too fast to keep a wet edge, you could also (or instead) use some XIM Latex Extender, which also helps the coating self-level a bit better than without it. Note that XIM Latex Extender is like water in consistency, and is quite a bit more potent than Floetrol - so much smaller amounts are recommended. Again, follow the recommendations on the Latex Extender container for mixing proportions.
And remember these are options only for water-based paints - don't add these products to alkyds.
