End Stone should have its value decreased again down to 448 EMC because it can be created by putting a bucket of lava (64 EMC) into a stone barrel and adding a handful of Glowstone dust (384 EMC).
Also, Draconium should not be worth 92 diamonds. I cheated-in a few items for a couple experiments. 100 End Stone sifted by an Automatic Sieve with a full stack of fortune upgrades yielded 12 Broken Draconium Ore and therefore three Draconium Ore Gravel (3% yield). 64 Draconium Ore Gravel bashed down with a diamond hammer enchanted with Fortune III yielded 125 Draconium Dust and therefore 125 Draconium Ingots (~195% yield). Statistically, this means one End Stone has a 6% chance to yield a full Draconium Ingot. As the numbers currently stand, a statistical investment of 17,545 EMC will yield 756,428 ECM, resulting is an investment return of 4311%. One could turn 2.14 diamonds into 92.34 diamonds in just a few minutes with the right technology. With solar panels and a Repair Talisman, the cost per process is zero.
If you keep End Stone at 1028 EMC apiece, then the math recommends that Draconium have a value of 17,545 EMC, so I suggest having it be worth two diamonds at 16,384 EMC. If you follow my recommendation to lower End Stone to 448 EMC apiece, then the math recommends that Draconium be brought down to 7,646 EMC, so I suggest having Draconium be worth three gold at 6,144 EMC.
If you want to leave Endstone at 1028 EMC apiece, then I recommend disabling the ability to make End Stone with lava and Glowstone so End Stone will warrant its Ender Pearl + Sandstone evaluation. If you also don't want to change Draconium's value, then I recommend drastically decreasing the chance for sifting one End Stone to yield Broken Draconium Ore down to .017% (1.7% of 1%) for Draconium to warrant such a massive EMC evaluation.
TL;DR
Everything considered, I believe it would be best to decrease the value of the Draconium Ingot to 16,384 EMC and disable making End Stone with lava + Glowstone in a stone barrel.