I recommend re-reading your LOTT literature regarding
exceptions such as no wastage in the opponents’ suit(s).
As for being massacred in 3Sx, that’s for inexperienced
science fair experiments like, say, J9xxx Q10xxx x xx.
With a legitimate reason to advertise a 2-suiter, and 2S
as opposed to a ...
(My 5H treatment is flawed spades *+/- 5-6m*, w/ no H loser.)
If 5H is strictly 2-suited and “slammish”, it would seem that
the “-ish” suffix drops off when partner badly misfits spades.
While 5OM as a slam demand if partner controls the preempted
suit is impractical, there is often room enough to distinguish concern
from unconcern about the suit. Here, I favor the following scheme:
4S/5C/5D or 6 of any unbid strain: natural, non-forcing.
4NT: both minors *or* independent spades ...
Ime, the latter is a theoretical rather than realistic risk.
At least one of the two opps will have extreme spade
shortness strongly-suggestive of action.