User blog comment:B214/Volume 22 spoilers/@comment-78.8.41.88-20161017150638/@comment-29963364-20161018160838

Remember, Ajuka adjusted Issei's Evil Pieces to adapt/handle Ddraig's power. He did this because after his Evil Pieces were exposed to Ddraig's full power through the [Juggernaut Drive] in vol.6, they couldn't properly handle it and ran the risk of malfunctioning.

The [Illegal Move Triana] and [Cardinal Crimson Promotion] work by channeling Ddraig's power through the (modified) Evil Pieces, so that Issei can access it while bypassing the negative effects. The difference between the IMT and CCQ is that the IMT could only use a portion of Ddraig's power, while CCQ could use all of it.

And the reason CCQ is as weak as it is, is because the form is still unstable. It's not just simply increasing Issei's power with Ddraig's (like the case with Vali's EJOD), but deligating that power to specific attributes individually (speed, magical power, strength & defense), and fusing those attributes together. It's pretty much a fusion of the three forms of IMT.

So like Azazel, Issei and Ddraig have said in the LN, if Issei trains and fully developes and masters all three forms of the IMT, then the CCQ will become more stable and it will be as strong as it's supposed to be.