Oh no! That's a shame, what's made it terrible? The fruit do something strange to it?
Apologies on the belated reply. I think that perhaps a beer of this type and huge strength, may just need a little more time. The spices and raisins may have just pushed it out a bit further than anticipated.
On reflection, it does not taste "bad" or "nasty" but merely, perhaps, immature for its style.
As it is, I think another six months.
On the plus side, the (GH) Bourbon Vanilla Stout started 14 October 2017 (last year) is much more drinkable now. But it is still "a lot" as #2 daughter would say.
In response to these observations, I have bought a 10L carboy (it holds nearer 11L) to condition these high strength beers going forward. If I were to do another, it would be "parti-gyle", with 10-12 L of wort done in a stove top pot, from the first "runnings" and a second beer done as usual in the GF.