Hello, 
First i would like to say great plugin! I am wanting to have more items in the heli crates, is there something that i have missed because it only drop crates with 1 item and never any more

Check the documentation page for this plugin, it may help you with handling custom loot. However, if you don't have custom loot enabled already and you're only getting one item, another plugin may be modifying it. The default loot config (which still must be enabled) for HeliControl should be much more than just one item.