Lowering the energy cost for ASF would not be the ideal solution to counter Strats as you may think.
By reducing the energy cost, you indirectly weaken the earlier air stages.
And we all know, T3 air does not need to be stronger.
Yes, the first Strat tends to be the strongest, but you can minimize its effectiveness with decent scouting and adequate preparation.
Worst case scenario, with a little bit of micro, a small group of Interceptors can eliminate the bomber.
That being said, in the upcoming balance patch, significant adjustments are being made to Strats.
They will require more energy to construct and will also have extended build times.
Take a look:
~ Stryker