Additional red LED lights

not worth it IMO. I like the lineup of soft whites and coll whites. I find excess red cause to much stretching.

I have tried the red led bar lights the ones on the market are not very bright and they seemed to make my plants stretch to much and not gain that much weight. I suggest if you want some extra light to add side lights but get full spectrum lights not just far red it will make the plants grow more weight and buds will get wider

While there is a measurable effect of cool vs warm light, It's seems to be a very small effect. Anecdote to be taken as a grain of salt: I had a strain I am familiar with and know it is very likely to be lanky / golf ball bud structure, and I put it under the 'cooler' CCT half of my room... it still grew lanky. Did the 3400K cause it to branch 1% more than the 2900K half? No idea, but whatever the effect was it was so small it was insignificant and irrelevant realtive to the greater impact of genetics. This isn't always the case, but seems to be in regard to CCT differences. I prefer my 2900K DIY lights, but I also can't honestly see any different to support that feeling, lol. I still put the plants i prefer more under my DIY. It makes me feel good, lol. It's okay to do some things like this but proof is in the pudding... either it's a big enough effect to notice or it's possibly just a correlation that is true and not too significant to notice a difference with the naked eye. In those cases the only context where it matters is when growing 1000s or plants. Do what makes you feel good. The only concern here is overloading on DLI. If you have room to give more light per day, then no additional adjustments need to be made. If you already give 'max' DLI relative to environmental conditions, you may need to dim or slightly raise your primary light to drop back down to a safe zone. Just common sense stuff. Stay in that goldielocks zone.

I think absolutely not needed. Your light fixture is a beast! Seriously, an FC-E6500! Your fixture also claims to have dynamic settings within the app. As long as you are following the phase in app, your spectrum should be right on the money with that fixture. Even if you had money to just throw at the tent, I would only suggest IR and only for sub-canopy but IR is literally heat so then you're left dealing with a very efficient heat source/not efficient light source.

Can only be a good thing, personally never bothered but I belive you only have them On for the last 6 hrs of the day but I'm sure someone will come along with that info for you... Good luck..