CM10.1 flash question

Hey guys I flashed Android 4.2.2 CM 10.1 M2 Rom on my Samsung galaxy tab 2 7.0 3113 today and I didn't clear dalvik cache before I flashed. Is that a bad thing? And can I flash over the rom again or do I have to go back to stock first? I also want to know how often do I need to do this?

Wipe Data
Wipe Cache
Wipe Dalvik (Under advanced in CWM)
Format System (under mounts and storage in CWM)
Install ROM (choose from sd card and then find your file)
Install Gapps
Hit "Go back"
Reboot phone

Sent from my SPH-L900 using Android Central Forums