Help Burnt edges on lower fan leaves and small bud sites burnt

[Freshlybaked]

Just wondering if anyone could help? I have two Berry White two blue dream and one Alaskan thunder fuck. I have them under a thousand watt high pressure sodium Phillips aggrolite XT bulb everything seems to be doing well and for the third week of flowering things seem to be moving along pretty good I have recently noticed the lower fan leaves on most of these plants are starting to get burnt edges and some of them are even just falling off none of the other leaves are falling off just the fan leaves that are affected. I recently have changed from tap water with about a 350 ppm to a spring fed mountain water that has 18 ppm so I don't know if there's a lack of something in the new water that my plants are not getting.
I I also started noticing on some of the smaller bud sites that are growing from the lower part of the plant are starting to turn from white to yellow the little hairs on them and I don't know if it's from the bulb of my light or if it's from something else or just natural most of the buds still are white but some of them look burnt I have pictures I will post if anyone could help please throw me your advice Thank you in advance.

[F10werChyld]

Looks like nute burn in photo 1, what are you feeding? How often? Grow mix?

[Freshlybaked]

Sensi Bloom a&b 8ml a gallon x 2 every other feed, water every 2 days straight water one feed next feed nutes
B-52 same feeding schedule 8 ml a gallon
Big bud same feeding schedule 8 ml a gallon
Fox farm happy frog soil
I accidentally for the first week and a half of flowering kept giving it sensi grow a&b instead of Sensi Bloom a&b
but the rest of the plant and all the other plants look great it's just as lower fan leaves that are kind of pointed down already they had a huge stretch during vegetative growth because of the light I was using and the distance but a couple of those fan leaves have fallen off and I haven't seen them on any other leaves. Mainly because of the distance I think is why they were pointed down not getting enough light. I was using the manufacturers recommendation on the bottle and trying to do half of that that way I was on the safe side but I did just recently up it when it went into flowering just because I always have before and now I'm afraid since I gave the true manufacturers recommendations I might have overfed them even though these leaves started doing this before I just recently overfed them so now here in about 3 hours I will find out if those nutrients really messed it up. Every other feeding schedule I was feeding them sensi zyme I'm not sure if that could cause it to lose some nutrients possibly since I wasn't really feeding them full go anyhow but hopefully this isn't just ramblings I just want to stop the problem before it gets further and I've noticed a few of my little bud sites have orange hairs on them when all the others have white and they're clearly not big enough to start changing I don't think so maybe it is from the nutrients also thanks for the advice though I appreciate it.