Focus frankenbike trash find commuter, BP Stealth carbon monocoque TT bike, Leader 720 tt, Quantec CC Cyclosross build, Eddy Merckx Corsa Extra Columbus SLX road bike
Oval Concepts Slam, that go on the stem cap.
Jtek Axe clip ons + Thompson X4 stem.
Deda Clip bars go right by the stem.
Otherwise - Profile Design Lighning Stryke and the Profile Design Lava or Hammer stem.
This is probably your best option as it shortens the effective top tube length, assuming your head tube is low enough.
I am considering the slam's. apparently they are designed for road bike geometry so you don't have to learn a new position for your body. I have made a post regarding these, and have not heard any information yet, also, not very many reviews on google either. are available with under-bar mount if your bars are higher (but with a tarmac, id doubt it). However with the tarmac you have a longer top tube, so the slams will bring the pads back a bit and probably make you more comfortable