I'm not sure exactly what Krallu's asking.
A. Would I fly if the cloudbase were below MSA/SSA but above DH where I'm going? Yes, provided I were in current practice. I've had engine "failure" too - in a single - and survived to tell the tale. I don't think cloudbase of 800 feet or 400 feet would make a lot of difference in the case of total engine failure - I'd be coming down at such a rate that it would be "what options have I up to 30 degrees either side of the nose?" in either case.
B. What DH minima do I apply? If I'm in current practice, the ones printed on the plates. Right now, not having flown an ILS for three months, I'd add a couple of hundred feet - but then, if the needles were bang in the middle, I'd cut myself a bit of slack on that.
By the way: minima is the plural of minimum. There's no such word as minimas (unless you meant to say "minimumses").