Get some bigger pots and fill them with soil so that the plant will sit at a good level.

Take the plant, put your palm on the soil, turn the plant upside-down, give the pot a couple taps and carefully slide it off. Place in the new bucket you prepared with soil and fill in the sides.

I'd say plant them in 3 gals (or so) now, and then a couple weeks into 12/12 put them into 5 gals. That's how I do it. When you keep a plant in the same soil for more than 6 to 8 weeks, you will have ph problems.

Since your plants are different sizes, it will vary a little with the pot sizes. I'd get a new (3gal) for the bigger one, and transplant the smaller one into the container you're using for the bigger one.