Additional thoughts
These points have been made but I'll try to say things a bit differently. The anchor point needs to be above where you are casting - if you want to cast 90 degrees, when you make the snap and rotate so you are facing across stream, the anchor needs to land just above you.
A key point that Derek indicates in his video is that when you do the final switch cast (and as others have said) it needs to be 180 degrees opposite your target. What often happens is that if your anchor lands too far upstream or if you have too much stick, most of the line will end up 180 degrees as it should but the end will still be at 90 degrees or parallel to the river flow (I think it is Simon's bloodly L) - I would think this would be more prevalent with a sink tip. This bit of line will often cause the collision you describe. Try to watch the tip carefully when you make your cast and try to ensure that it all turns when you make the switch cast (roll cast)
These points have been made but I'll try to say things a bit differently. The anchor point needs to be above where you are casting - if you want to cast 90 degrees, when you make the snap and rotate so you are facing across stream, the anchor needs to land just above you.
A key point that Derek indicates in his video is that when you do the final switch cast (and as others have said) it needs to be 180 degrees opposite your target. What often happens is that if your anchor lands too far upstream or if you have too much stick, most of the line will end up 180 degrees as it should but the end will still be at 90 degrees or parallel to the river flow (I think it is Simon's bloodly L) - I would think this would be more prevalent with a sink tip. This bit of line will often cause the collision you describe. Try to watch the tip carefully when you make your cast and try to ensure that it all turns when you make the switch cast (roll cast)
