Well I've just had a play and switched some bits round. Swapped the ridge for a full length 10m 2mm dynaglide line first, then I swapped these for 4m tie outs ...
Old tarp rig - 2.35lbs or 38oz
New rig with full 2mm ridge - 1.76lbs or 27.8oz
New rig with 4m 2mm tie outs - 1.71lbs or 26.4oz
Not only has it shaved off a good few ounces but it also packs down smaller.
Thanks guys, that's made room for a 12oz steak now