Tube Match question for Tekton Speaker & Dennis Had Inspire Firebottle

Hello fellow ’Goners,

For the past eighteen months and until last week, I had been running a pair of Golden Lion KT88’s in my Dennis Had Inspire Firebottle KT88 SEP. Over the months of reading various sources on tubes, I discovered many kind reviews of the GL KT77 and so I bought a pair a few weeks ago. Installed about seven days ago, I was immediately impressed with the KT77’s enhanced bass, both more full and more nuanced, not to mention the improvement in instrument separation throughout the sound field. Soundstage is also more palpable and some instrument sounds have finally found their "place," if that makes sense.

So, moments ago, I decided to review the spec sheet for the recommended tubes, provided by Mr. Had. Therein I discovered Dennis has sorted his recommended tubes into 8ohm and 4ohm categories. The KT88 is recommended for 4 ohm speakers. I have Tekton Moabs, running at 4ohms, so the KT88 is a good fit. I also noted that the KT77’s are listed in the category for 8ohm speakers. Wow. Not good? I’m not sure. Is this simply a recommendation or are there technical limitations that I’m running through that will damage amplifier, preamplifier (by referential impacts?), or speaker parts in the near or long term?

I’m not sure if I can post a link here, but there is a datasheet download available for the Golden Lion KT77 at the tube store dot com. I will see if I can post the link herein, but I figured one of your techies might have some useful comments and insights into this matter of concern.

Thanks for your time.
I would think it would be similar to the situation with 4 and 8 ohm taps where one sounds slightly better than the other but other than that it doesn't really make any difference. Speaker impedance is as I'm sure you know nominal. Not fixed, it varies, sometimes all over the place. So hard to see having anything resembling a problem, but instead only a small sonic preference for one over another, like the way it is with the taps.
It's the way the valve is voiced. KT88 are just better at deep bass and EL34s are renowned for silky smooth midbass, mids and highs.. Good valve to 60 hz or so and they really start to struggle.  It's harder on the amp too 4 vs 8. Try the 8 ohm tap, won't hurt a thing. Might sound better still. 

Second that little amp may not have the oomph to push KT88 they way they need to be pushed. Two KT88 can hit almost 90 watts when set up in a push pull amp.

The "Firebottle" only has one 'tap.' Dennis claims the unit can drive speakers from 2 to 20 ohms. 

This amp runs low wattage: KT88's push 11 wpc; KT77's push 9wpc.

I assume this could prolong tube life. Also, the Moabs are known to be easy to drive, even at 4ohms. I had them on a Nuforce STA200 for several months and that amp isn't rated for 4ohms, and yet it had little trouble with the Moabs, barely ever growing warm.