Ted,
Re the disposable booster, you will be better with it worn inside your diaper. However, lots of folks wear a pair of cotton underpants between the diaper and plastic pants to catch small leaks.
The possibilities are almost limitless, but for greater absorption and peace of mind, you might try "double diapering." By double diapering I mean to wear two disposable diapers, one over the other. Cut small holes or slits in the backing of the first diaper so that excess urine will pass through to the second diaper and be absorbed there.
Then add 2 pair of PUL pants, i.e., one pair of larger PUL pants (sized to fit over a cloth diaper( worn over your regular PUL pants (sized for a disposable diaper). The leg elastic of the larger pair of PUL pants (sized for a cloth diaper) should make skin contact on your thigh lower than the PUL pants sized for the disposable. This way any leak that actually escapes your normal plastic pants will be stopped by the second pair.
I'm sure you will get lots of suggestions.
--John