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I suppose it's worth a shot. I think you have a better chance in speaking than writing, though. The 25/30 in writing indicates that both essays were probably scored as 4/5. It's doubtful that new raters would look at either of your essays and view it as 5/5 (although you must have had one 4.5 the first time to earn a 27 in writing).
Even though you scored a 23/30 on speaking, meaning all 3's, your past scores in speaking and writing indicate that you are at the high end of the range, so I think you have a decent chance of one of the two scores being increased.