Tiling around bathtub help needed

Hello,
I am half way through my bathroom renovation and have realised that the newly tiled walls (concrete board+tiles) are not perpendicular. I am now left with a small irregular gap between the bath and the wall and not sure what to do. Ideas and suggestions much appreciated!

The bath should have been cut into the wall to remove that gap and then the bath tiled down on to to create a good seal

I am a DIYER.

Take off a row of tiles that matches where bath rim is (ie where bath is currently touching the tiles).
Push bath against the now exposed concrete board.
Raise the bath (wooden blocks under feet) so top of bath a couple of mm below bottom of the tiles.
(I screw a length of wood onto wall, so it sits under rim of bath, stopping bath flexing / moving down wall when people/water get into bath).
Silicone to fill between tiles and top of bath (I sometimes do this twice - first time pushing it all the way into gap to fill gap, second time ontop to make a nice rounded silicone shape.

Re-cut new tile at the two ends of bath in rounded shape to match shape of edge of bath.

SFK