Because these samples are loud, they will clip your mixer channel immediately. Turn your sample track volume down by -6db to -8db upon import.
Do not add heavy distortion to the Hey Haterz 808s. They already have it. Instead, use or standard FL Studio Soft Clipper on the master. A tiny bit of reverb (0% dry, 15% wet) on a send channel gives the 808s space without losing punch. B K Bangerz Hey Haterz Drum Kit