First off You can only do 3 enchanted Moulinet as your gauge maxes at 100/100. RDM only has 3 moves that do AoE damage, Scatter, Contre Sixte & Moulinet/Enchanted Moulinet. The quickest way to get 3 enchanted moulinets and still be doing AoE damage is to spam scatter non stop until you reach 45/45 then use manafication to get to 90/90 of your black and white mana gauge and then proceed to moulinet away, as cost 30/30 for each enchanted moulinet.
What do you mean by different light effects? Do you mean when Scatter is showing the dotted yellow square around it? If that is what you mean that just means you will gain more points in the gauge if you use scatter when its highlighted like that.
If after you use the melee combo and verflare and verholy are up and either verstone or verfire are already proc'd just use the one that has less in the gauge and completely ignore the verstone or verfire. sometimes it will work out that you can proc both and sometimes it will not and you end up wasting the proc, however, the damage from verholy and verflare is worth the wasted proc.
For building back up the opposite side. so they are close to balanced I would suggest you use swift cast + acceleration veraero/verthunder right away if you have those up. if you do not have those up you can use the proc from verstone/verfire and then use dualcast on veraero/verhunder you will usually not exceed the 30pt limit which will cause the gauge to slow down. If those are not up. Use Impactful or Jolt, (if impactful is up always use that over jolt) then dualcast to veraero/verthunder if it procs use the proc and the same mana type in the dual cast to get it back up. this usually takes 2-3 casts to get it balanced.
If this doesn't help explain what I think you are asking PM me and I will give you my discord contact and try to explain it over voice chat. Or I can meet you on Balmung after 5:30pm pst on one of my Alts.