For DWC I never add things like enzymes, folics and for sure nothing bio-active like hydroguard etc.
For sure silica should be the first thing added to your water. With most the pH goes up so high that it can cause precipitation of many of the salts in the nutes added after.. The reason I say to pH down to around 7 is that the nutes to follow will have some buffers that work well in PH 5-8 but get overwhelmed with something like 10pH that cheaper types of potassium silicate can raise the water to. I have a bottle of that stuff that I will use if I run out of Rhino but will make sure to pH down before nuting.
For 3-part nutes it's recommended that Micro goes in first but after that the order doesn't really matter. I have my airstones going and just measure out what I want and toss in. The flow created by the stones will mix everything up fine.
Using Rhino Skin from AN for my silicate I've found that the pH only goes up to about 8.4 in RO water but after adding the rest of the nutes it drops down to around 5.8 which is where the pH Perfect nutes seem to like to sit for me. I've also noticed that my pH pen doesn't seem to read properly with the pH Perfect nutes like something in them does not compute. When I mixed up a test batch of H.O.G. nutes that are almost identical to GH 3-part they read fine even when dripping in some pH up or down so I know it's not the pen. (I have a diploma in chemistry and often inform people how to properly feed and care for their pH and other gear.)
I've been active on many forums since '09 and my main focus has been helping nOObs get a grow to a happy end. I live way up north in Alberta and can't afford to go hang out at the various protests etc or donate money to various causes. I still volunteer my time to be Admin on one of the first pot forums ever started from a Vancouver cannabis culture base. Not for the owners but for the members. I'm still amazed every time the forums load when I log on but as they are part of a larger organization they keep chugging along. If I quit it'll be buried in spam in a week.
Your plan on how to mix nutes is basically fine and for those that like to use the other things I don't use it should work great.