Unlocking bootloader in rooted and flashed st15

hi all
i have some questions to ask
i'm a possessor of an xperia mini st15i (italian version i think)
i rooted the stock .587 ics, installed via xparts a sort of clockworkmod emulation (cause it's on system partition i think)
and flashed phone with real ics 4 for locked bootloader based on stock .462
i did this following some howtos in this forum and whitout unlocking bootloader.
now i would like to unlock that bootloader, install native clockworkmod and the android official version from google, possibly gingerbread
cause speed issues on ics, here are the questions
can i proceed following normal howtos ignoring what i did to my phone?
are there any guide to read?
do exist some ics based rom for locked bootloader that gives an evident increase of performance?
thank you all in advance and excuse me if i ask something i could find searching in the forum, i tried but i didn't find anything but a guide for xperia neo v
cheers

here you go
http://unlockbootloader.sonymobile.com/
is Sony spying on users in this forum?
http://talk.sonymobile.com/thread/60197
Don't forget to mark the Correct Answers & Helpful Answers
UNRELATED topic, if you have some time please check this thread
http://talk.sonymobile.com/message/244522#244522
"I'd rather be hated for who I am, than loved for who I am not." Kurt Cobain (1967-1994)

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