Just tried Amsoil SAE 190 gearoil with LIQUI MOLY GEAR OIL ADDITIVE MoS2 added. Definite improvement over Miller's 140 with the same additive. especially in the 50 to 70 mph range. I wanted to try the Amsoil SAE 250 but it is not available in the uk even though its on their web site.

http://www.performanceoilsltd.co.uk/amsoil_drag_racing.html
https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F322796888469