You have some nice looking plants which look like they will outgrow your greenhouse, to bush them as was previously said you can top them (pinch them out) or train them by bending the tops down.
I personally have my plants in smaller solid pots that allow me to tilt or even lay them down on a stand if they get too tall.
I love the Sativa plants, and I always let mine go for an extra two weeks, the cold seems to make them really sticky.
Watering is best not done to a schedule, but rather done to requirement you can use the finger in the soil method or go by pot weight (which looks like you can’t do), just watering because you always do it on a specific day is not the correct way to do it, weather and life cycle determines how much water the plant will drink and therefore how much you need to water.
Here is four simple things you can do to prevent yourself from having difficulty later on, they are as follows:-
1 – Prevent attack from flying insect by covering all openings with netting; doing this will keeps moths away and other flying insects that may harbor mites.
2 – Prevent crawling insect by covering the floor with Rhubarb leaves; the leaves of a Rhubarb plant contains Oxalic Acid which is toxic to insects, and also toxic to animals if ingested.
3 – To stave of large temperature swings you can store sealed canisters of water inside the greenhouse; the water will heat up during the day and re-radiate heat during the night which is a bit like a storage heater and dampens the effect of hot day / cold night temperature swings.
Some people even keep a compost heap inside large poly-tunnels as a form of heating.
4 – Prevent Molds by investing in a sulfur burner (vaporizer) and some fans; the sulfur burner burns for 15 minutes an hour after night falls and again another 15 minutes an hour before sunrise. Doors and windows need to be shut when using a sulfur burner and the burner must not be used while the temperature is above 90°F
Another thing to note is if you detect condensation on the inside of the greenhouse walls, you are in danger of getting mold and you should vent you greenhouse to prevent this.