I just beat Mr Cancer himself in a random 2's game.
Probably worth a watch to get some ideas on how to beat it.
My general strategy was to use German Mechanized Doctrine (4CP Smoke Bombs, 5 CP Spotting Scopes, LeFh & Command Tank).
Lefh is the key to emplacement spam in longer games, should you be able to survive till 8 CP. It is pretty difficult for a Brit to keep up repairs with on map firing at you. Panthers are also pretty important as well as you need tanks that can safely park in front of a bofors.
I started out with a Gren heavy build, skipping an mg entirely. Knowing he would go emplacements (its all he ever does) an MG isn't all that useful if its forced away by a mortar constantly. With Grens you are able to keep mobility which is pretty key.
I then fast teched to T2 and got 2x 222's and a PaK out. 222's are a great unit because of the mobility on a map like that they can offer. They kill any pesky Brens that are still around. Once they hit vet 2 with spotting scopes, you have a nice map hack.
My next plan was just to decap their fuel while trying to hold ours. Because of all the fuel invested in emplacements + them not always holding their fuel, he was only able to get a Cromwell out 1 min before I had a panther. I also built 3 fuel caches as soon as I could to speed up the panther.
Once my Panther was built I pretty much had enough resources to build an LeFh straight away. Once I started firing he ended up quitting (rage ? ). They probably could have won it just by VP camping but his emplacement spam was effectively dead once that was on the field.
My ally did have some issues with the USF down south at some points - would have liked to have helped him out more but it is important to try to deny them fuel as well as minimize bleed to get the above units out.
He also tried to use MHT & mortars to kill the emplacements. However counter barrage was causing him problems (this should mostly be fixed when the patch hits). Once counter barrage is less effective / spammable, them heavy indirect fire will be more viable.
Spotting scopes + paks are a decent way of taking out bofos. You need to bait his barrage though so your pak can safely fire.
Not to rain on your parade but.... you guys were losing 85-498 VPs with almost no map control until the brit player dropped from the game. Until that point you had killed 0 of his 3 emplacements. Maybe you meant to show how strong the brit cheese is LOL.
Side note: it's hilarious to watch an un-braced bofors almost outheal the damage from 2 mortar HT flame barrages + normal attacks with only repairs from the forward assembly engineers. Good shit.