Getting the maximum speed out of MSP430G2553 16MHz

I am failing to set MSP430 to it's maximum speed of 16MHz

I am only getting 1.3MHz. I use CCS and the following code. As you see in the comments I have already tried a lot:

#include <msp430.h>

int main(void) {

    WDTCTL = WDTPW | WDTHOLD;

// Stop watchdog timer

BCSCTL1 = CALBC1_16MHZ;

// Set range

//DCOCTL = 0x00;  // Set DCO step and modulation

//BCSCTL2 =0;

DCOCTL = CALDCO_16MHZ; 

// Set DCO step and modulation 

// raising SMCLK freq to abou 10Mhz

 //BCSCTL1 = RSEL3 + RSEL2 + RSEL1 + RSEL0;

 //DCOCTL = DCO0 + DCO1 + DCO2;

// BCSCTL1 = 0xFF; // RSEL3 + RSEL2 + RSEL1 + RSEL0;

//DCOCTL = DCO0 + DCO1 + DCO2; 

//CSCTL1 |= (DCORSEL|DCOFSEL0);         // select 20 MHz

 //CSCTL3 &= ~(DIVM0|DIVM1|DIVM2|DIVS0); // divider

    P1DIR |= (BIT0 + BIT1 + BIT2 + BIT3 + BIT4 + BIT5);

    P2DIR |= (BIT0 + BIT3);

    P1OUT &= ~(BIT0 + BIT1 + BIT2 + BIT3 + BIT4 + BIT5);   

while(1){

    P1OUT ^= BIT5; // I can't get a higher pin oscillation than 1.3MHz on the oscilloscope ; I expected around 8 MHz for one cycle on, one cycle off , am I wrong?

    }

return 0;

}