Default [p7510] Rolling screen / no bootscreen

Well, I have 2 problems with gt-p7510 zto (brazil version)
If I install stock rom, the tablet works great, but no samsung logo at boot, No animation (i cannot see recovery / flash screen selection when I boot with volume down key, If I select one with volume+ I can see the screen correctly.
when android boot, I cannot see anything till I sleep and wake up the tablet, then the tablet works great.
If I install cwm, I cannot see cwm most times, sometimes work and great.
the partial solution was flash a bootloader, bootscreen and recovery works great, but I fall in rolling wake up

If I install any custom rom, the problem was the rolling screen after wake up, I try with some custom kernel with cwm, the problem was wifi, that dont work. the bootsplash or animation works great.

Something that Im making bad?
Im stuck at 4.0.4 android with touchwiz....


thanks so much