Basically, lithium-based batteries like the one in your computer have a useful life of 400-500 charge cycles. The "up to 300" is based on Apple's spec that a properly maintained notebook battery should maintain 80% health for 300 cycles.
As Kappy stated, your battery is in great shape (note that Kappy is assuming you have a 15" MBP, which is probably the case; if you have a 17" MBP your health is 86%, which is not great, but is still good and within spec). My only recommendation would be to calibrate your battery every month or so:
http://support.apple.com/kb/HT1490
(Normally, calibrating every two months is appropriate, but you do not seem to use your battery that much - 7 cycles in 5 months - so monthly calibration is better for you. My personal recommendation is 1-2 cycles per week.)