Extrude Base Tangent to Surface

I need help extruding a surface and keeping it tangent to another surface. I have a model made from airfoil profiles that I can't seem to get what I want. As shown in the first model (274) I have the sides rounded using a revolve base of the flat surface about an axis through its center, and it worked perfect. I then changed the front end to be rounded (290) and can't do the same thing because the front edge isn't perpendicular to the surface and it leaves a discontinuity (301). I have tried surface fill as well, but cant get the new extrusion to be tangent to the existing surface (304 and 306). I just need the flat surfaces to be rounded and for everything to be continuous (no sharp edges or points) like the original (274). What can I do?

As part of the migration from the legacy Forum to the new SOLIDWORKS Forum, there was an overlap in timing where the new Forum was being loaded with historical data from an export migration, while at the same time, the legacy Forum was still operating during the period of March 12th to March 31st. Due to the overlapping timelines and import-export technical issues, posts during that time-frame could not have their media imported. If you created a post in the legacy Forum during that time-frame and wish to update the post in the new Forum with supporting media, please go to your post in the new Forum, enter into Edit mode and re-add any supporting media you want to insert.

The easiest way to find your posted content is: from the new Forum, click on your profile icon in the top right of the GUI, then select "My Profile" and you will be taken to the "Overview" tab where you can see all of your posting history.

Thank you