Initial climb rate for the B-1a was greater than 16K ft/min, and they went just not quite 600mph above 10k.
Heini Dittmar got the V4 trial version up to 623mph in late '41 by having it towed into the air by a Bf 110C. At that point, it compressed, rather suddenly, it seems, and he had to cut the engine to recover. As a result, they redesigned the wing for the Me 163B, and you couldn't make the thing go fast enough to compress or spin. So no, you couldn't compress it going up.
