When installing braid line because eof the slippage that can occur it is
recommended that mono backing on the reel be applied before spooling the
braided.

If you think the reel is a problem contact Shimano and they me be able to
help you. I own several baitcasters spooled with braided line and have not
found such problem with any of them when the braided line is spooled
properly.

Sarge