OK, I lied with the Spade splinter. Trouble is, I forget the precise wording the explanation of 4N (where I bid 4S), but it was not Blackwood of any flavour. I figured that if I bid 4S as a splinter, there was a chance that GIB might Blackwood, and then an outside chance that it could follow up with 5N to confirm all key cards held. But it was not to be, and in the end I just had to guess.
Well, I guessed that partner may have the Ace of Clubs. Or RHO might have it and LHO not find the Club lead.
The double was ominous, but all worked out in the end.
You may not like Soloway jump shifts, but I would expect you to agree that you should have the advantage when they crop up.

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ing) tr. v. - Any bid made by bridge player with which partner disagrees.