For some reason my drag feels a little skewed in an exponential path in drag pressure.

The first 1/2 of turning the star drag feels like the drag isn't engaging and its like I'm just taking in spare/free star drag turns that are doing nothing. It isn't until half way where my star drag starts to grip and feel like its starting to engage and then its a exponential increase in drag pressure from there until I lock out the drag at full capacity and the star drag won't turn anymore.

Will adding an extra 1 or 2 metal washer's somewhere in the drag train/chain make the drag pressure feel more linear/constant from start to finish?

You don't get any drag until tightening drag star (nut) begins compressing the drag stack.

The only reel I know that gets a long linear drag response is Isuzu, because it has a helical spring in the drag stack (p/n 46)

Every other reel I know gets their drag spring from a single or pair of elliptical (bellville) washers, which is not going to give that long, linear rate of a coil spring.

The bellville washers are p/n 5131 in this Abu C3 stack, and you'll find these in just about every other reel.

You can put M8 shim washers on top of the drag stack. These don't change the spring rate of the bellville washers, but compress and engage the drag stack sooner on tightening the drag star/nut. Since I brought up Isuzu, they use 0.2-mm stainless shim washers at the bottom of the stack, p/n 45 in the first schematic I showed. Here's 0.5-mm Avail brass shim washer on top of older Ambassadeur drag stack. There's a single 5131 bellville washer at the bottom in the drag stack.

I keep a cache of Avail and Isuzu shim washers just for tuning drag stack height. Shimming ensures you get full drag before bottoming the drag star/nut.

You can also make the drag stack taller by replacing worn drag washers with new, e.g., carbontex.

Here's an expensive and somewhat astounding drag-resolution-upgrade to small-frame Shimano spinner. MTCW offers TD drag cap for small-frame Shimano and Daiwa - unfortunately, since Shimano changed cap design with '22 Stella, it only fits '18 Stella series, '19 Stradic through through '21Twin Power (small frame) - also 20-30% price reduction currently.

The spring response and drag load in spinning reel drag caps is simply elastic (reversible) strain in the hollow plastic cap. This results in the total drag range occurring only in the final half-turn of the drag cap. MTCW TD drag is all metal, with a coil spring inside the drag cap. It comes with 2 spring rates, XUL and full-drag.

The cap clicker also doubles the number of drag-click detentes when setting drag.

The total drag range covers 2-1/2 turns of the drag cap, and gives extreme resolution setting drag, especially good in small-frame finesse fishing.

You can also add finger drag by pushing on the front of the cap to further compress the spring.

works - this beastie made two 50-yd runs on Major Craft XUL rockfish rod.

gotta wonder where OP goes with this much complete detail in an answer - maybe it was a rhetorical question.