I NEED TIPS, HEAT STRESS, LIGHT STRESS, LIGHT TOO ...

if the nodes at the top remain tightly packed, yeah, the light is a tad too high at moment. I can tell by node spacing lower on plant that this was not the case before. The thin leaves could be related or could be too much p/k (chlorosis is part of that symptom, can verify that with any leaf chart). if you switched to "bloom" nutes, these often come with too much p/k. I think this is nute-related, not light related.. but do keep an eye on those developing internodes at top.. make sure tehy don't remain too tight (or too lanky). As long as they are developing the light is fine.. this is your guide. A measurement for light only puts you in a ballpark. Local variables like atmospheric co2, temp and rh all impact how much DLI a plant can take each day before it is negatively impacted. You can only find that 'maximum' through trial and error. Take notes when you find it. Seasonal changes may cause for different maximums, so you may need different notes for summer vs winter etc.