I'm back from lunch... getting posts started now.
Brom - we can continue with the backposts if you like, or we can chalk the remainder of lunch up to "behind the scenes" moments. Completely up to you, my brother! I imagine that Tochi filled Asovil in on his misgivings about the ambassadors with as much detail as he'd given when he spoke with Drake, of course, but where the conversation might have gone from there... *shrugs* ... Anyhoo, like I said, we can continue or conspire as you see fit.
Also, re: the tachyon detection grid. Per Memory Alpha:
"A tachyon detection grid was a technique developed by Starfleet as a means of detecting cloaked Romulan warships. The grid used active tachyon beams transmitted between different starships or sentry posts to create a tachyon field; any cloaked ship entering this field would be exposed. The technique was developed by USS Enterprise-D chief engineer Geordi La Forge in early 2368, although it resembled and was probably derived from crude sensor grid techniques used to detect cloaked ships that had been used as far back as 2154 in the buildup to the Earth-Romulan War. (ENT: "United") "
The way I'm reading this is that, while it didn't become a common technique until Geordi rigged it up in 2368, similar things had been accomplished much earlier... So, as Olan said, Lt Sh'iraolnas might very well figure something out where that's concerned.
