if you have s-off,theres no harm in letting the phone update. s-off will remain,you can use the other guide here to reinstall recovery and re-root.
id pretty strongly consider to simply install a custom rom based on the newest firmware.im sure there is one thats bsically stock,with a few enhancements,including the low space fix that plauged stock phones.
youll also want to somehow get back to the GB baseband. either install it as a PB31IMG,run an ruu,or let the phone OTA. any of those will get it back for you.
The Delivery Guy
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