Two Retro 30 speakers or a mix of Retro/Veteran?

So I have a custom built Zilla 2x12 cabinet which is basically very similar to a Bogner 2x12 OS or the Diezel 2x12 cab. I was using the cabinet with a brighter sounding Hot-Rod Marshall style amp earlier and had no problems with the speakers. I have now moved on to a darker sounding amplifier and find that the cabinet (or rather the speakers) could have a brighter, more cutting tone to them and an even tighter low end. I was recommended a front-loaded cabinet by the amp manufacturer for a more aggressive and tighter sound but I'd rather just try changing the speakers as it is a wonderful cabinet already.

I mostly play metal and hard rock so I was thinking the Retro 30s would have a nice and cutting sound with all that mid-range push. But I'm still thinking if I should do a mix of two different speakers and a Retro/Veteran combo might be interesting since both are a variation of the V30 speaker which to me is the definition of a speaker that not only has balls but can still cut in a mix. The current speakers are Eminence Governor/Man O War and I have to be a bit careful with the bass and depth dials on my amp for the low end to not get a bit too boomy. Now the Veteran is apparently a darker sounding speaker so would I be better off just going for two Retro 30s rather than the mix of Retro/Veteran? How about a Retro/Invader mix? I wouldn't want the tone to be too harsh either if I want to do a smoother, more modern sound...

Thanks!