If you have leaf blade attack requirement, you can use 1 hand range weapons, and it works mint with range! i have done it in the past with nieve tasks, some were dodgy. dragons didnt work very well because it would think it was meleing them.
but if you never start dragonslayer, thats not a problem! vaneka tasks 100% flawless with single hand thrown, or crossbows. (obviously use at ur own risk)
im doing mele now, but this account was originally 100% range. got 80 from cannon, and ranging slay tasks
ive gotten 82 but then i got ban, nieve tasks, its a good idea to watch until you know all the tasks are ironed out.
also hard to say if it was from the slay bot or not.