Keep in mind that im almost always playing 1v1s. I have used osttruppen since release and i still find them viable. If you blob 3 osts, murica will have hard time closing the gap.
My buildorder is very different.
3 osttruppen, retreat capping pios for T1, mg, ost. I usually never get bunkers before midgame, where i might get 1 or two. When i get T2 i get a fast pak or if I feel daring I go for shrecks. From here it is very situational. I also often get a gren /w LMG for anti-rifle play.
I was never a huge ostheer fan. But with this tactic I win more than I lose