15K for a ship is nearing the poly limit for SFC3. I do not know the poly limit for SFC2/OP, but I would imagine that the same would apply as well.
I haven't used the Gagarin in SFC3 yet. Been kinda lazy about getting her speced out. But, if you want, send tha model this way and we'll gladly see how she runs in SFC.
Can't hurt to try.