As stated above, try and obtain a Slayer Staff, considering you are already 50 range and mage, you'll need to maul most tasks in order to stay str based. When pking, most maulers will use the event RPG to maul combo, which is what i use when I am pking, the ss is best for training or fighting people with defence. I recommend staying on the path you're going and keeping 1 prayer. I currently use a dramen staff on my mauler because of the crush bonus it has [RCs are weak to crush], until i can obtain the SS myself.
feel free to join the cc 'clan io'
it's a obby mauling cc, if you have any other questions, most ranks in that cc are very knowledgeable and willing to assist you.