That's good to hear. I'm far from match fit for a full game of league but get the ball in my hands and i'll create...
Are the matches played on full league fields??
A couple of tips for you.
1. Try to tag with both hands. If you come from the side and swipe down from the top against the guys tag with both hands, it'll fall off or you'll drag it off. If you stand there and try to "pinch" the tag, or grab it with one hand at the bottom, you will miss it 9 / 10 times. If you are in front of the guy, plant your feet and grab both tags if possible. Remember to plant the feet first though as the contact rule is a lot like basketball.
2. Keep your hands up while running with the ball. The hardest thing I found when I first started playing was trying not to slap a guys hand away or palm him off. Keep your hands high and away from the tag and you should be right.
3. It's not touch so you don't have to beat the defender with your whole body. You just have to beat them with your tags. If you can introduce a hip swerve or something similar into your running style (especially if you have little or no step), that you can manage without having to slow down, you will beat them a lot of the time. Sometimes just running hard at a gap is enough as the faster the tag is moving, the harder it is to remove.
4. When you run through a gap, don't stop until you either see the tag hit the ground, or you are called back. Sometimes the tags come off half way or make that tearing sound without actually falling off. You will be amazed how many times this happens and how many people you see, stop and miss out on scoring a try because of it.