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On a more serious note, I used to work as an alignment tech for about 5 years. So I feel qualified to say that you have effectively decreased your castor angle by raising the rear of the car. You should feel that the steering is less effort and more responsive to your input. Straight line accelleration should not be affected in this situation, but the handling should be much improved.
raising will also change camber towards the positive side - you should take it to a good shop and make sure everything is correctly adjusted.
and yes, I also did 4-corner caster/camber/toe alignments on many makes and models for about 5 years...
It makes sense, it's just physics. If the back is lower than the front, you're going up hill all the time. Now that the back is higher, it will be faster and you'll get better gas mileage because you're running down hill.