Readily available (meaning easy to obtain most any time - not currently being produced but only found once a year) I would recommend Peterson Flake. It has Bright and Brown VAs and has a deeper, darker flavor compared to OGS and SNF, whilst still retaining some of those brighter, sweet notes to the profile. It adds some bready and earthy notes, which would be more akin to the Capstan Blue that you've smoked, though sans the top note. Kind of sits in between the afforementioned blends in flavor profile.
Another great available blend would be GL Pease Union Square. Looks to have been recommended already, and I will piggyback the recommendation. Aside the caveat of it being a broken flake, it combines Bright and Red VAs, adding a deeper sweetness to the sweet notes, along with a rich, savory, spicy tartness. Truly an exceptional smoke.
Two other darker VAs that I would highly recommend (though more patience required to acquire) are Samuel Gawith Best Brown Flake and Full Virginia Flake. Not much I could say to add to their reputation. These have a deep tea-like quality to their flavor profile that I find absolutely delicious. These two are to be sought out by any respected VA smoker, IMO.
One last recommendation is Gawith Hoggarth Happy Brown Bogie. This is my all-time favorite tobacco. Provides the most "tobacco" flavor, along with enough nicotine to keep you satiated if you're a heavyweight. It will deeply seat you into your britches if you're less-than-adapted to a strong dose of nicotine. Extremely dark, earthy and deeply robust flavor profile. This description should not however be a detractor. It should be a no-holds-barred, highest recommendation for cigar smokers looking to transition into pipes and for any tobacco connoisseur. It is a twist tobacco, and I find a double guillotine cigar cutter most effective for slicing fine coins, to then be rubbed out and dried a bit before smoking.