Howdy and welcome!
In my experience, if my mouth is always feeling dirty with an almost metallic taste -- yes, that is my sign to me that I'm in ketosis. A quick check with a Ketostix has always confirmed this.
For me, it's the *ONLY* downside of this whole thing. I usually feel fan-freaking-tastic when in ketosis otherwise.
Best wishes to you, FeelingBetterAlready. Being able to ride horses again is one of my biggest motivators for rehabbing my back, so I definitely understand and empathize. Such a joyous, soul-nourishing experience!
"Let food be thy medicine and medicine be thy food." -- Hippocrates