[LAU] VST and latency

Hi all, I am running jack 0.116 and ardour 2.7.1 on a 64-bit fedora 10 based planetccrma machine. I am using energy-xt to host VST plugins and I have to use jackbridge because of the 64-bit jack. I am seeing large latencies when running effects loops through the VST setup. For example, I will typically have a buss in ardour with an insert using a VST reverb plugin hosted by energy-XT. The return audio is audibly late (sounds like by more than 20 msec). Obviously the wineasio/jackbridge/energy-xt/vst effect loop is not reporting its latency back to Ardour. Any suggestions for handling this? Any idea where the latency is? Thanks! -Joe D