With a -25 Phy level, it isn't surprising that you have 250+ Mesh rates. Changing the 2-way splitter to a green labeled splitter should drop the Phy level [loss] to around -10. This won't change/improve the Mesh rates because they're already good and the loss is well within range. When the loss gets above -40 [dB], is when the Mesh rates start to drop due to a loss of the signal to noise ratio. The receiver will report an error during system test when the Mesh rates drop to or below 220.