UE data like everything like all other data is published to advance an agenda since I don't know the explicit agenda I don't use it.
Then why are BLS numbers never significantly different from Gallup's Poll? For March, Gallup's % (not seasonally adjusted) was 10% +- 0.7, so between 9.3 and 10.7. BLS's was 9.2 +-0.2, so between 9.0 and 9.4. Both are at 90% confidence. At 95% confidence it's 9% - 11% for Gallup and 8.9% - 9.4% for BLS
Plus, I really don't think it's possible to manipulate the data significantly. There are 14 business days from the beginning of collection until publication...9 business days from end of collection to publication. That's barely enough time to calculate all the tables and data that are published, and no time at all to redo everything down to micro-data level. Add on that no one outside the BLS and Census CPS offices have access to the data (Sec Labor and the President receive a copy of the report the night before release), and you just can't do it...too many cells to change and figure out what the changes would do.
And, the current BLS commissioner is a Bush appointee, so has no motive to advance an Obama political agenda (and Bush had a Clinton appointee for his first two years, and Clinton had a Bush I appointee his first 2 years etc).
The number problems you're seeing could be from some systematic nonsampling error...a factor of the seasonal adjustment and rounding, etc. You can't look at one apparent anamoly and reach the conclusion that the books are cooked without any other supporting evidence.