Gaps in stair skirting when replacing carpeted stairs with hardwood

We have finished laying hardwoods upstairs and pulled the carpet off stairs to start that part of the project. We sawed off the lip of wood to make room for new bullnose tread, like the flooring store said to do. We're using white risers and teak treads. The problem is we will have gap issues in the stair skirt. Please see picture. Even when adding the depth of the riser (not pictured in yet), we're left with an inch of gap and/or leftover wood lip. You can see the bullnose tread we plan to install in the picture and what little it covers of our stair skirt. What possible solutions do we have? We're new to laying floors on stairs. Thanks in advance!

 

Could you post another pic but from further back?

The riser gets installed first, then the tread so it will overlap the riser. Is that the only spot that has a gap on the side? A painted piece of molding might not be perfect but is probably what will need to be used.

 

attached are a few more pictures, it happens on every step on both sides minus the left side after the landing which butts against the wall. we know the risers go first and then the tread, but the particular floor we got has a very small bullnose edge which won't cover much at all. I'm not sure if it would be easier/better to add a piece of plywood to bring the risers all out or attempt to fill w/ wood filler since it will all be repainted white. (these are the two solutions I've read so far) considering we took the time to saw off the old noses already, I was hoping to avoid using plywood as a shim (or else we could have just fit the plywood under the existing nose we already sawed off. but i want it to look clean and finished, and i want it to last. The other downside to bumping out the risers would be that we already did the floor upstairs and bumping the top step riser would cause a gap that would have to be filled with a 2 inch sliver of flooring since we laid the hallway upstairs with the measurements of the bullnose (they didn't have in stock when we put the up stairs floor down. would love if someone had some pictures of example of both of these being done….or someone who has had experience doing either/both these methods….or a new method would be great too! the risers are roughly the same thickness as the inner wood piece that you can see in the bottom picture, thus leaving the gap (the wood still under the skirt is what is left of the old nosing which we can't seem to figure out show to get out…yet.

 

Never, never begin a project until you have the actual material in hand and can see how it will go up. Obviously, the flooring store guy did not know that you had your stair balusters captured in a free stand alone portion of the stairs. Cutting them back with the mini stairnose was not the correct way to proceed with the project. Also, the fact that you just - finished the upstairs install - without consideration of the stair nose is another rookie mistake.

You are going to have to custom rip fill pieces and nail up to the risers so that when you nail your new riser up, it come over the edge of the cut off stair tread with the new nosing installed. Your SOL on the upstairs landing having a sliver cut - no way to correct.

This project required more math than was performed, and more common sense when installing to see in advance that it would not work out. Don't take flooring sales people as experts...