Bandwidth allocation really doesn't affect multipath to any great degree because 'bits is bits'. They either get there clean, and decodable, or they don't. The PSIP table timing is the same, the error correction is the same, only the amount of the channel allocation is changed.
A far more likely influence on your multipath is the trees beginning to get leaves again and changing the whole multipath landscape. It will probably continue to vary until the rain stops (June, July,?) and then stablize for the summer.