I am trying to fix the fin and added some geometry to the fin, hoping that the connection between the fin and the main body could handle a greater difference. (Hope you understand my English - my French is even worse than this....

)
Still, the body keeps a bump above the fin. Where should I add extra lines now to smooth this out?
See first picture: Should I add more loops of edges? Between the body and fin?
See second picture: I also thought about adding lines between the selected loop on the picture going towards to line of the body. Like the selected line on the second picture.
Who can help me out with some detailed instructions?
Jacqueline