Any advice about this? Apart from get more skilful 
or a marker rod (I'm not carping!)
I don't want to drag my hook and bait along the bottom if I can avoid that. Snags etc... Can't see how you can clip-up, because the spool needs to be free for the line to pull through the float.
A single marker stop knot will let you know if you're off, but I don't know if it helps other than letting you know to re-cast?
If you feel it go through your fingers when feathering the line against the spool, you're already too long and casting beyond and drawing back is complex... if you let the line settle and you're long winding in both pulls in the slack line and also draws back the float so when you re-settle you are likely to miss your distance and line marker.
I'm thinking 2 marking stop knots on the line, 1st to warn as it feathers past your fingers and a second to stop the line at for a set distance, then let settle, before closing the bail? Marking the cast as it lands not after it settles.
That might help me repeat the same distance cast after cast.
Is there another trick I don't know about?
I don't want to drag my hook and bait along the bottom if I can avoid that. Snags etc... Can't see how you can clip-up, because the spool needs to be free for the line to pull through the float.
A single marker stop knot will let you know if you're off, but I don't know if it helps other than letting you know to re-cast?
If you feel it go through your fingers when feathering the line against the spool, you're already too long and casting beyond and drawing back is complex... if you let the line settle and you're long winding in both pulls in the slack line and also draws back the float so when you re-settle you are likely to miss your distance and line marker.
I'm thinking 2 marking stop knots on the line, 1st to warn as it feathers past your fingers and a second to stop the line at for a set distance, then let settle, before closing the bail? Marking the cast as it lands not after it settles.
That might help me repeat the same distance cast after cast.
Is there another trick I don't know about?