1st grow...does she look ok??

This is my first grow. I started with 3 plants and ended up with 1 female. I just started flowering (12/12) almost 2 weeks ago. I'm excited, but as a newb I'm worried I'm screwing something up. Everything looks decent to me, but any thoughts on how she looks would be helpful. I'm using (3) 40w (125w equiv) CFL along with (4) 23w (100w equiv) CFL. I'm using MG bloom boost (I know ppl are gonna bitch, but it's the only thing at Lowes that had any decent nute ratio.) My main worries are 1) the leaf tips are curling down. I'm not sure if the lights are to close and its heat damage. I have a fan blowing on her which can't be seen in the pics. 2) I only have her in a 9.5" pot and I'm not sure if she'll get rootbound while flowering. Is it ok to transplant while in flower stage?? 3) The fan leaf stems are red/purple. Is this ok? I've read different things...some say it is lacking potassium(K) and some say it is ok... The water I'm feeding her has a pH of about 6.8-7. I know I should get it lower. Is it ok to lower the pH with lemon juice? Again...I've read different opinions on this. Thanks everyone

Your ph is fine,let the water from the sink sit out overnight,to evap the chloromine or use ro water to lower you ph.If your gonna transplant,nows the time,just be careful.Its never too late to transplant.Dont listen to the bs. )Could be heat stress
...what are your temps??? below 85° and you should be ok.Could be slight N overdose.When you started to flower you should have fed with a more PK heavy nutes with a little sugar.Purple stems are normal on some strains but sometimes its a sign of a phosphorus deficiency.GL.peace