PP amp + High sensivity speakers dilemma

So here's the situation.
Recent experience with high sens (91 and 94) single driver speaker has  won me over from the low (87db) speaker design. 
Seems the SET is  the ideal match for high sensitivity ~~FR~~ driver.

I recently made upgrades to the Defy7 and am not willing to part with the amp and take a loss. At least not yet, until i recover from my $1800 loss upgrading the 87db speakers which are sitting in a  corner right now.
Was thinking just now, 
what if we swap out the 12 KT88's for a  dozen EL34's, 
The 34's come in at a  much lower watt output 25, vs the 88's 40 watts.
This  might allow a  bit more flexibility on using more gain on the linestage vol knob. 
Also what if we bias the EL34's a  bit lower than specs. This might also lower watt output thus giving a  tad more ability to use more gain on the linestage volume knob.
Right now i only use 9oclock vol on the DLP linestage, both with the Seas Thors 87 db and also with the 91 6.5 FR which I am using now, 
Tonight i will pick upa  pair of Sony cabinets off CL and install the 94db FR 8 inch.

Its definetly more sens vs the 91db, speaker, so maybe even at the low 9 oclock gain it may come a  bit too forward for my preference.
I listen to low/mid volume, as I use music more as a backdrop while reading. 
In some years after i recover from all the mods/tweaks i;'ve made in my system past year, i will purchase a  LM 845 amplifer.
I have intentions adding a  new high sens driver which will  be  rated 98db. 
Now here is where there may be issues with the 100 watt PP amplifier. 
Perhaps Richard Gray may install a  Italian 47 step attenuator which will provide more volume control on the Jadis DPL linestage. = Can use a  high vol gain.
My 88's have about 1500 hrs, so its getting close to buy new power tubes.
Bottom Q is
EL34/biased a  bit low + 97 db sens speaker,, maybe i can just squeeze by  with this lopsided matching,  for some years, til i can get cash for a  845 SET. 
Doable?
All ideas welcomed.