The first thing I'd do is ditch the thermostats. That's an old wives tale about needing them. Those pumps aren't that efficient that you need to slow the water down. If the flattie is running around 120 without them and conditions start it heating up you've got more leeway than if you're starting at 180. If you look at the LRDG pictures the trucks usually had the hoods removed to allow for more air flow in the hot conditions.
Did you do anything to clean the water passages on the engine and rad? If not that can cause problems. If that's the case put some Drano in the rad and run it for half a day then drain and flush. It's amazing what that gets rid of.
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1940 Cab 11 C8 Wireless with 1A2 box & 11 set
1940 Cab 11 C8 cab and chassis
1940 Cab 11 C15 with 2A1 & Motley mount & Lewis gun
1940 Cab 11 F15A w/ Chev rear ends
1941 Cab 12 F15A
1942-44 Cab 13 F15A x 5
1942 cab 13 F15A with 2B1 box
1943 cab 13 F15A with 2H1 box
1943 Cab 13 C8A HUP
1944 Cab 13 C15A with 2C1 box
1943 Cletrac M2 High Speed Tractor
MkII Bren gun carrier chassis x 2
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