Current ball line up consists of Realty, Zen, Rubicon UC2 and Hustle Ink.   Thinking of upgrading the UC2 and was thinking of the following options:

Hyped Solid,  Wolverine Moss or wait on the new Spectre (Revenant).   Any opinions.

UC2 is a really good ball.

If you wanted something closer in reaction but stronger than the Ink, the Hyped Solid would be it. A clear step down from Zen would be a Wolverine

Current ball line up consists of Realty, Zen, Rubicon UC2 and Hustle Ink.   Thinking of upgrading the UC2 and was thinking of the following options:

Hyped Solid,  Wolverine Moss or wait on the new Spectre (Revenant).   Any opinions.

Just out of curiosity.  Why would you consider the Hyped Solid as a replacement for the UC2?  One ball you did not mention that would have core numbers very close to the Rubicon just without the asymmetry is the Phaze 5.  The two balls spoken about the most regarding Storm/Roto/900 that are currently available are the P5 and the Fate.  IMO the Fate is the more versatile of the two but the P5 is also a favorite among Storm Nation at the moment.  But the P5 having the famed R2S cover would probably be the better option if you are looking medium/dry.