Well Fozzer..Ended up in almost a similar situation years ago. Sunday mornings the Missus and I would saddle the bike, ride out to meet our biker friends for breakfast, then afterwards hit the roads till late Sunday night.
That was through the years on various bikes, circa 650cc - 750cc. With two up, I would always feel these bikes a bit underpowered, not making for the best ride.
(South Africa is a land of many hills and mountains, and I have always felt somewhat uncomfortable being underpowered when there is no reserve power to "ride out" of a situation).
Then came the answer to it all. We bought this 1400cc Suzuki Intruder, and what a difference it made.
Top speed? Naaaw... 80 MPH given a tail wind and the missus at home.
Torque? Now we're talking. Hardly ever a gear change, up hill or down, two up or not.
On the side:
Went on the annual "Rhino rally" in South Africa one year, as you do, when I met a youngster with a seriously impressive and in-depth knowledge of bikes, acknowledged by all.
Everybody, friends and family, simply knew him as "Sprocket"..