Problem with my Mac mini downgrade mavericks to OS X Lion

Hello experts,

I have a Mac mini early 2009 2.3 Ghz i5 with 8 gb ram and it has OS X Lion pre-installed when I got it it was super fast I was shocked cause I wasn't used to fast machines, anyway, with time apple released mavericks I wasn't ready for the update but I viewed comments of people about it and finally I did the biggest error which I upgraded it.

Most of my apps crashes, sometimes the boot is too slow and I gave to wait minutes for the dock to appear the thing that never happened with OS X lion.

I decided to remove mavericks and I did a backup for my files and everything.

I rebooted my Mac and pressed Alt but I got mavericks in the recovery partition.

I was like : What??

I then downloaded Mac OS X Lion and made a bootable USB through diskmaker.

When I went to startup disk and choose the bootable USB I clicked on reboot and then the Mac rebooted with a circle  and A bar on it in the center of the screen with nothing. The system didn't recognize my bootable USB.

Then I went to disk utility by pressing command+R, I deleted the partition and I think that I deleted the recovery partition because when I press Alt I cannot find it then I pressed the command+R to get to the recovery through the internet, while I'm typing this, my Mac is downloading the files through the internet and by he way this is the second time it does this because the first time it rebooted nothing happen just the circle with a bar in the center of the screen I don't know what I have to do, should I go first to disk utility to delete the partition and its contents of the copied USB files before clicking on reinstall Mac OS X Lion?????

Any idea