As stated above, this will only speed up the transition to T3 because it is always more profitable to equip a mass extractor with storage facilities, even if, in your case, this will cost additional energy. This doesn't solve the problem of quickly transitioning to T3; in fact, it exacerbates it, because more mass means a faster transition to the really killer things and ignoring those units that quickly lose relevance.
If you want to make the transition longer and make T1-T2 units last longer, you can create a mod to increase the transition time to T2 and T3, respectively.
Besides, I play a modpack that implements this; it has a really long ramp-up to T3 and truly huge armies of T1 and T2 units. You can check out my thread.