I currently started 15 seeds from some bagweed i had which id like to practice and get my skills before i buy some exotic seeds. all 15 seeds germinated within 2 days and i planted them all in jiffy pellets and placed the pellets in 2 inch jiggy pots until 2 days later i noticed the roots like 4 inches below the jiffy pellet in 2 days. So i replanted the jiffy pellets in 9 oz syrofoam cups so i wouldnt have to transplant the plants again for like 2 more weeks.
My process was VERY similar to yours. I however, lost my first two batches of germinated 'bag seeds' and eventually got the process right. I am now nursing my little sprouts along nicely.

They are doing well. I will post updates images to my Grow Log and my post in the Indoor Growing forum.

My sprouts are responding well and steadily growing. You are doing an excellent job keep at it.