iBusTrx problem... lag?

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While troubleshooting I had make the loop as small as possible and added WAKE pin13... so I can see the LED and it also enables ICs tx, rx is always enabled...

void loop(){

digitalWrite(WAKE, HIGH);
  if (ibusTrx.available()) { 

    ibusTrx.write(prevButton);
digitalWrite(WAKE, LOW);
  }
}

if I put digitalWrite(WAKE, HIGH); after the if (ibusTrx.available()) { line it never gets high...

if I remove if (ibusTrx.available()) { data doesnt get sent... but I dont understand why... if (ibusTrx.available()) { is for rx not tx....