I find something a little strange, whenever I made the enemies max level of 75 for the Dragon Alter Advance Quest, Dragon X always appear and the rarer version appears more often. Do the sort of bosses that appear at the end of these quests depend on the amount of the capsules you put into it? I'm going to do something like that again for my Hero Client Order for beating a Dragon X. Can someone confirm this for me?

Higher Risk means a higher chance of rare enemy variants. However, the Risk does not effect which of the two boss types will appear, rather that is just up to RNG (randomness, not Ranged power); if you are only getting Dragon X/Noire Drahl and never seeing Goron Zran/Zoron Goraal, then you have just been having some unusual RNG.