Elevate the soviet base. Sitting at the bottom of a cliff is a sitting duck base. Also totally blind to incoming attacks. Demos can roll it from the clifftop into the base (with gap gens if hinds are present).
All the while the allies are on a clifftop, very easy to defend, see the whole map from, and it's hard to attack it.
This has been a problem since always, not Delta specific. Elevate that dang soviet base on ridgewar please.