A bit of a cheat waiting for the best to do some runs first:
1 au GTP_DHolland 1'48.118 1'35.860 3'23.978
2 au GTP_mad94d 1'48.448 1'36.074 3'24.522
3 pt meagainstyou 1'48.324 1'36.355 3'24.679
4 es GTro_rootbe 1'48.542 1'36.223 3'24.765
5 ch feutz5 1'48.342 1'36.431 3'24.773
6 au hkkc666 1'48.492 1'36.469 3'24.961
7 us GTP_timeattack 1'48.428 1'36.571 3'24.999
(could not get on the Japanese board)
So with some improvement in sight:
1'47.XXX High and 1'35.XXX Low seem the most likely at the moment
My objectives are a lot higher (which means more modest in this context)