Maybe whatever you're using to measuring it is off a little because the packs are dead on their good just burped the jar to get it down to 62 then your good to go but I wouldn't even worry about it popped the packs set it forget it
Hard to say if you have more spots i would lean more to something else do you have other pics with the burn marks just want to make sure but sounds like over feeding if a lot of tips are burning it may be time for a PH flush to fix and get back on track
So you where drying out but still Looks good. How's the humidity you can see the corner of the leaves curving that a sine of low humidity if you have a water bottle kicking around a little mist here and there will help and keep bugs away.
I do it all the time T5 or CFL for clones and seeds. you'll be fine just don't feed the little ones for two weeks they pack food in the seed after two weeks go easy on the first feeding keep up the good work
Its all good not to worry thats how life is we get so busy with day to day stuff but its always good to roll a joint bust a Dab and chill with the good people at 420 Mag happy health to everyone :Namaste: