Well found my fastest team.
I didn't want to move my Valhalla and Forge tallis from elsewhere, but agree that Starfire and Ragnarok are must haves for speed, waves 3 and 5 kill themselves. I get a pretty consistent 35 secs per run, fastest was 28 secs.
Ended up with 56 runs, 2 keys in a row.
WED Ed - ragnarok/ecco cos
Gun Dog - siege/freeze cos/rondo gold
Poss Rockets - banner/blind cos/rando
Axis Bomb boy - Starfires
Thanks for the suggestions everyone. I mainly wanted to break the 50 run barrier.
And Azagthor, you're not going to get much faster than that. When you're trying to finish the achievements you can't use the right tallis to speed it up.