From some of the other questions you've posted it sounds like you have a really bad base map. It doesn't sound like you have an Element Tuning version of the Hydra EMS as I don't sell these outside of North America but if you are interested we do sell base maps and tech support to those who do not own an Element Hydra.
Based on the amount of backfire and the fire ball it sounds like your main fuel map is much too rich in the lower vacuum load sites.
Good luck.
Phil
www.elementtuning.com