ADS1298 Lead-Off problem

Hello, everyone! 

I'm try to use DC Lead-off method in my ADS1298. Here is my sample code:

   SendCmdADS1298(ADS_SDATAC);      

    WriteADS1298Reg(ADS_LOFF,  0x13);                                    

    WriteADS1298Reg(ADS_CONFIG4, 0x02);    

    WriteADS1298Reg(ADS_LOFF_SENSP, 0xFF);

    WriteADS1298Reg(ADS_LOFF_SENSN, 0xFF); 

    WriteADS1298Reg(ADS_LOFF_FLIP, 0x00);

    SendCmdADS1298(ADS_RDATAC);      

    LeadOff = 0;

    PacketCount =0;

    while(PacketCount<8)

    {

        FlgRec = 0 ;  while(!FlgRec);                                           // Recieve data from SPI

        PacketLeadOff =  (SPIRx[0]<<4) | (SPIRx[1]>>4) ;                // LeadOff detection      

        PacketLeadOffF = (SPIRx[1]<<4) | (SPIRx[2]>>4) ;

        if (PacketLeadOffF==0xFF)   {PacketLeadOff = PacketLeadOffF;}    

        LeadOff |= PacketLeadOff;

        PacketCount++;

    }

    SendCmdADS1298(ADS_SDATAC);      

    WriteADS1298Reg(ADS_CONFIG3, 0xDC);            

    WriteADS1298Reg(ADS_LOFF,  0x00);       

    WriteADS1298Reg(ADS_CONFIG4, 0x00);    

    WriteADS1298Reg(ADS_LOFF_SENSP, 0x00);

    WriteADS1298Reg(ADS_LOFF_SENSN, 0x00);    

    SendCmdADS1298(ADS_RDATAC);      

    if (LeadOff&Channels)

    {

        SendCharToUART(UART_Device, 0x07); 

        SendCharToUART(UART_Device, LeadOff&Channels);      

        return;  

    }

It's work! I can really detect if electode is off. But when i switch eletrodes to normal mode i see long transient:

On picture - red line - right hand, blue line - chest 1. DC lead-off repeats 8 times switching LOFF_FLIP.

I have to wait much time before i can measure ECG signal! And time of transient process differs for different people!

Is there any ways to stop drift and fast normalize signal ?

Thanks in advance