"I have cleaned the internals and was actually thinking of placing a few washers/shims under the trigger spring to see if the added tension helped in anyway. Problem is though, I would need to disassemble the whole trigger system just to get at the spring so thats probably gonna be a last resort"
Ok, you've tried 3 types of ammo,, so that may not be the problem. But to be sure,, maybe try a few different factory loads to be sure. Ruger uses factory ammo to test fire their guns.
You mention you've cleaned the internals. Did you do any disassembly of the gun to do so?
You said you were thinking of placing shims under the trigger spring. You mentioned how you'd have to do a "whole disassembly" here. Not true. The trigger RETURN spring,,, that gives it tension & all is not of a design to allow shimming.
The HAMMER strut spring,, is a coil spring over the strut which gives the hammer the force necessary to fire the gun. A few things here. (1) Ruger hammer springs are,, if anything,, heavier than necessary in general. I seriously doubt that's an issue. But to give you a thought,,,(2) to remove the hammer spring assy,, (strut & spring,) it's not hard. Remove the grips, cock the hammer. You'll see a hole in the bottom of the strut. Insert a stiff, short metal pin into the hole to capture the strut against the spring keeper. Then carefully pull the trigger, with the thumb on the hammer & lower the hammer. The spring will be captured on the strut, and can easily be removed out one side.
Unless I'm mistaken,, this disassembly is shown in the owners manual. I haven't looked lately into a NM manual to check.
(3) For those who prefer a lighter hammer spring,, they then clamp the top end of the hammer strut into a padded vise, then using an old fork (metal & kind heavy) they compress the spring from the end with the pin,, pull the pin, then CAREFULLY relax the tension. BE VERY CAREFUL AS THIS SPRING IS HEAVY DUTY!
But I really do not think the issue is the spring tension.
Try this;
With an UNLOADED gun,, looking into the hammer channel,, slowly cock the hammer & watch the transfer bar as it rises. It should rise up, and place the top end over the firing pin area. quite often,, you can still see part of the top of the rear portion of the firing pin. Then,, while still watching it,, holding the hammer,, pull the trigger & the transfer bar should rise up just a very small amount,, depending upon how they timed everything during the build.
If that does like I've explained,, the action is doing it's job correctly.
And if that's all good, then while still holding the trigger rearward,, drop the hammer. Keeping rearward pressure on the trigger,, turn the gun sideways,, and look in the gap between the frame & cylinder where the firing pin protrudes. You should be able to see the firing pin quite easily & it should go far enough forward of the frame to easily strike a primer.
If not,, you may have some internal gunk in behind the firing pin. This is where a good flushing with brake cleaner comes in. UNLESS YOU ARE AN EXPERIENCED GUN MECHANIC OR GUNSMITH,, DO NOT ATTEMPT THE REMOVAL OF THE FIRING PIN ASSY.
Flushing the firing pin area from both ends,, (remove the cylinder & cock the hammer,) may be all that's needed.
Of course,, oil afterwards.