I'd have to second Silents opinion to quit topping them. Yea you run the risk of stunting them, great they didnt stunt. You're also forgeting the stress you're causing the girls, should you have a female there is a high percentage that you will now end up with hermies.

Really not enough light at all for veg, none the less for flower when they triple in size. Outside is better, if you're afraid of it being "too cold" build a tiny greenhouse for cheap. You can build one out of pvc, rebar, and poly of course. Google it, you will see some ideas. Silent is right, 50F is not too cold.

For next time, Tinfoil is NEVER a good reflective material to use. When using brighter HID lights, you can create hot spots off crinkles in tinfoil and create burns in your girl. Misting is never great either, the plant sustains everything it needs from the roots it has grown.

Instead of spending 90% on a 150w HPS, spend another 40$ and get a 400w MH/HPS switchable. 40 more bucks for what, 250 watts of lighting? DEAL.

Goodluck on your venture.