Any chance the formula will be fixed soon and will work as intended?
Being the one that brought up the matter that the soft cap does not work as advertised, let me comment on this:
a) I replayed the GCs in Manstein and Rommel difficulty, and got to DV in every scenario. Of course, knowing scenarios helped, as I had played them before (on Rommel). But I was far from knowing when and where counterattacks would occur, from example.
b) I managed to get up to 60.000 prestige in Rommel and 100k in Manstein before Softcap kicked in, which was at Olchovatka (1943, on Rommel) and Storming Stalingrad (1942, on Manstein). From that point on, I cruised quite comfortable on the prestige I had accumulated.
c) I did some careful planning on my core from early on, always keeping an eye on future costs of upgrades, when to overstrength, which transport to choose etc. One good example is the 10.5 leFH arty. As arty was always > 1/4 of my core, the type selected matters a lot. Many players choose the sFH15, which costs more and does almost nothing more considering the result of kills+suppression. The sFH15 kills more, but suppresses less. But it costs more, which is just a waste of money.
Also, I learned to use the StuG series to its full potential, which opened a bunch of new possibilities which I simply had never tried out.
And many players overlook cheap solutions like the Bf 109k, which does a lot less damage than a Fw190, but has higher initiative and is therefore a perfect unit to finish off enemies that have only few SP left;
d) Yes, you need King Tigers late in the game, those JS2 simply aren't beatable otherwise. But theres usually few JS2 on any map, so its perfectly ok to sport just a few KTs and mix them with Panthers and Tigers. On Manstein, I went all the way deep into 45 with 3 KTs.
e) ATs are another unit class I had totally underused in the past and have learned to aprreciate a lot.
So, careful planning of your setup and learning to use unit classes right is the key to getting along with the Soft Cap quite easily. Even on Manstein, where Overstrengthening all of your units to maximum is indispensable in 1945, I was hovering around an avg unit value of 600 in every scenario. In 1944 Manstein, I had an average of 530 prestige over all scenarios, thus giving me 45% prestige even with the "defect" soft cap calculation.
Indeed, after finishing the GCs I think that the current Soft Cap calculation is well as it is; while not working as advertised, it enforces good gameplay and leaves the player with large amounts of prestige even on the highest levels of difficulty. Also, a mix of units in the core is much more likely to occur, as you simply keep more low level units than without the soft cap. Leave Soft Cap as it is, thats my opinion.