Increase the SHARED_POOL_SIZE to reduce latch contention.
A large number of Space request for log buffer is due to very small log buffer size. How ever in your case it is no high. Try to increase the log buffer size and bounce the database and monitor the performance.
I've been monitoring my log activity and my redo log space requests steadily increase each day, however it looks like the number only increases at log switches. Currently my logs switch about once every 2 hours. The performance really isn't an issue since it's a small development database, I'm just trying to learn what I can.
I've increased my log buffer a few times just to see the effect, my log buffer is currently 2097152, or 2048K and the requests still hit me at log switches.
Is it common to have the requests (usually 1-3) during log switches or is there something else I can do to help eliminate them?