Very slow write speed in SSD OCZ Vertex II (no Mac edition) in "Lion"

Hi guys
I have an iMac mid-2010: i7 2,93/8Gb/ATI HD 5700/1Tb HDD + OSX Lion 10.7.2
The SO seemed very slow, so I decided to add an SSD... In Apple authorized service center recomended OCZ Vertex II 120 SSD (no Mac Edition)...
Hardware instalation by Apple´s Service It´s OK, SSD show on Mac information (Spanish)
Before installing "Lion", I did a speed test, with these results
My surprise is that the SSD is very slow in writing... Read results speed It´s Ok...
FW up to update v1.35 (factory default)... And the install "Trim Enabler" because the result It´s the same...
What do you think is the problem?

I"m having the same (mostly) problem. Any thoughts?

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