agree with Hydro Junkie, the brass shft log is abit to small in internal diameter, with a 1/4 inch shaft you only have 1/32 nd of an inch around the shaft for lubrication, thats not enough. if you can remove the tube log and fit a 3/8 inch I.D. tube this will give 1/16 th all round the shaft.
also cut the fin off the strut and bring the strut down so its closer to the ski plate as this ski is there for lifting the transom .