LTM 11050 cause slowdown with Cisco WAAS enabled

With Cisco WAAs enable we are seeing download speeds of 75kbs across an https connection. The moment we turn off the WAAS we see the rate go up to 350 kbs. Is there anyway this could be caused by the TCP Segmentation Offload (TSO)? We see the TCP packet length is 1200 or 2400 with the WAAS turned off and this is the faster connection. The connection with the WAAS turned on has a TCP packet length of 14333 and 25000. Could LSO need to be turned off?