For me, it depends on how fast the current is moving, and whether or not I am confident in fish being localized in a particualr location along the seam.
If I think fish are localized
If the current is slow-moderate, I will use the bowmount to position my boat outside the seam (in the faster water), just across from the water I want to pitch (on the seam or inside the seam, in the slower water). I’ll cast to the seam or just across it (into the slower water), and let the bait work downstream.
If the current is rocking, I’ll position myself inside the seam, and use the anchor to hold my position. Then, I’ll cast to the faster water just outside the seam, to the seam itself, or to the slower water inside the seam. Again, let the current do the work with your bait.
If fish are widely dispersed, or I’m trying to find fish
With moderate to slow-ish current, I’ll drag jigs downstream, just outside the seam so fish along the seam or feeding in the slightly faster water can see my presentations.
With fast current, I’ll pull 3-ways upstream at ~ 0.5-1 mph, along the seam, outside, and inside the seam.
For guys that don’t know what a current seam looks like, take a look at the pic below. This was taken below Everts last weekend. On the left is fast, rippled water, ~ 1.7 mph current. On the right is slow, relatively flat water, with no downstream flow and in places a slight upstream return flow. Right where the ripples meet the flat water is the seam…almost right down the middle of this frame,