If the router is associated, the settings you have would work. If it is not working and there is no communications in either direction, then they are most likely not associated or you have an antenna problem.
Doing a Network reset on the router is the best way to find out. When done properly, you will notice that the Association indicator will go solid and then start flashing. That flashing is what shows it has associated. For association to function, you must be able to have two way communications. You can also verify this process by querying the ATAI command after the NR0 was issued.
Broadcast mode requires delays between transmissions. This is done by design to allow for the packets to propagate through the network. So there is no way to prevent delays from accruing on a broadcast type transmission.