Default Downgrading?

Couldn't find anything but has anoyone managef going from 4.4 to 4.3 without issue's?

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Phones:
Xperia X8 ROM: GingerDx Status: Dead
Xperia Play ROM: Reverted Back to Stock Status: Working But used as Spare.
Galaxy S3 ROM: Revolt 4.3 Status: Dead (Swapped)
Xperia Z ROM: Stock Unrooted Locked Boot-loader Status: Traded In
Xperia Z1 Rom Stock Un-rooted Bl Locked Status: In Use