[Amps] low power problem in linear 500w 160m

[tzikas tzik]

hi i have constructed this linear
http://tzitzikas.webs.com/linear__500w.JPGat 160m band.
the problem is that the linear gives at output only 300w max. i have tried
other bigger ferrite beads and other mosfet's manufacturer , but nothing.
Also the resistors in operation time are very warm (i have used 2w carbon
resistors).
i am thinking to remove the negative feedbach (i am thinking to remove
resistors R10,R11)
What do you think about that? It will helps to increase the output power or
the linear willhave stabillity problems? thank you.