Should go something along these lines-
You: ATC, G-ABCD Flight Information Service.
ATC: G-ABCD, pass your message.
You: Callsign,
Aircraft Type,
Routing To,From, Via,
Position,
Altitude,
Request (FIS, Transit your overhead, etc).
I'm unfamiliar with TRPACER as I was taught CARPARK but sure its similar. I agree that 'waffletime' is a problem that can easily be reduced by sticking to a set format.
It definately isn't overkill! By sticking to this format reduces the risk of missing out important info, appears more professional and should lead to a safer flight.
Cheers,
CapCon