After changing my hboot to stock, i also encountered the internal space to fill up. I'm using amarullz instead of stock, and now (did a full wipe) have about 70 MB free in internal. I tried to restore all my apps to default location or to previous location (was using amarullz since 0.4), and after about 90 apps internal is full and Titanium keeps showing "restoring", but no progress. SD-ext also fills up (was about 400 MB used). Is this just the big dalvik cache, or are there some hidden problems? I never encountered any issues while using CM7r2, but had decided to switch because of the various reported problems (as stock should be more stable).
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LG Optimus 4X HD
Unlocked - Werewolf JB
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Phone history: Sony CD-5 -> Siemens SL10 -> Sharp GX-10 -> Sony V600 -> HTC Desire -> LG Optimus 4X HD