Protein skimming aside since I think they are a given necessity..
And you don't need opinions on flow..
Back in the late 90s, when the jaubert system became more known and then the concept of plenums and then dsbs to reduce algea/no3, I became a strong believer in dsbs as a backbone for reef system health and stability. More recently, though, as my sps obsession has solidified, I think I'm more of a sand less (or very shallow sand in display), filter sock, bacterial driven (or good bacterial friendly media driven) system person
When I say bacterial driven, I don't necessarily mean full carbon dosing to control nutrients, I mean small carbondosing using a media like siporax or seachem matrix as surface for large colonies of bacteria. As opposed to large amounts of live rock.. this allows for removal, manipulation of your bacterial colonies..
I have had great success using a reverse daylight refugium but have also had succes without.. recently, I stopped being able to keep macro algea alive and instead of trying to add this or that to get the cheato to grow, I simply abandoned the refugium. The coral have not really noticed.. although my nutrient may be higher because of it.. gotta deal with that...
Personally, I think n around 5ppm and p around .03-.09 ppm are ideal for sps health and colour.
I have had best succes with an alk between 6.5 and 7.5..
I'm still a believer in mh or t5 as the optimum light source for sps. But I will acknowledge that there are many beautiful sps reefs using led.. I still like mh/t5 better. I personally feel that t5mh will allow sps to develop and display truer and more natural coloration.. sticky point I know but that's my opinion...
I have always used ca reactors. Never really tried dosers, although as of the last few months I am using a doser to add ro water to my kalk stirrer..
I don't even know where to go on trace element additions.. I've tried them and I think I saw really nice growth and coloration due to their additions but because one can't really accurately test for many of them, I currently don't dose any...... but.... I'm not entirely happy with all my sps colors or growth so I am once again thinking about trying some..
Being an extreme vet yourself, I don't know if any of this is really helpful to you as it's probably not new to you but hey! There it is!
I must say I very much look forward to watching both your sps obsession and corresponding sps tank grow into total awesomeness!