Pro Mid field monitors vs audiophile speakers.

If you're hearing Tekton mushy and without detail, it could be your ears, it could be your room, or it could be your related equipment, but it is not the speakers. No idea what you mean by "better specs" but specs in general are an awful way to buy speakers. With speakers, the only spec that matters is sensitivity. Look for speakers like Tekton with sensitivity 95 dB or more.  

How small is "smallish"? In a big room the distance between walls gives time and space for reflections to be delayed and attenuated, ideally to where they are pleasing ambience. In a small room the same reflections come so soon there is hardly any delay, and so high in volume the reflections compete with direct sound and it all muddles together. So it  becomes much more critical to listen relatively closer to the speakers in a small room. Also room treatment will help a lot with this.  

But again, main thing, it is not the Tekton Impact Monitors. No way.

The Hedd and Focal would both be better so I see no downside. You might widen your search and include Genelec, Adam and Neumann. Any of these would give you a more accurate presentation and clear the mushiness.

Powered studio speakers are very good. No real down side just a different way of doing it. Most are tuned to be flat and you might not like the sound. Some have a lot of adjustments which can be nice. I find focal’s monitors to be pretty good and comparable to hi-fi speakers of the same size. 
Sometimes you get better bass out of powered speakers. All depends on how it is all implemented.