I also use the Penn reel seat but find it to be to bulky when I have the reel on the butt of the rod, when using a ABU 6500 reel I have to pack the reel seat so that the reel is gripped, Fuji are now producing a moveable reel seat which is featured on the Greys rods, found that they do not grip the rods extremely well rods need to be built up with shrink tube to get good grip, not tried Abu reel seat as they will not currentley supply them with out a rod and say it will be two years before they do.
Gwyn