My front brakes are Sh1t

[Fazerider]

Brake fluid from a container that was first opened a month ago should be fine unless you've been storing the bottle in the shower.
If it's air in the system that's causing the sponginess it can often be bled out at a banjo rather than a bleed nipple, tiny bubbles tend to stick in corners and are reluctant to find their way to the official exit. Another technique I've used is to take the calipers off and push the pistons in firmly to sweep stuck bubbles in the lines upwards... if you try this do it one caliper at a time, you want to force the bubbles back up to the master cylinder, not pop untended pistons onto the ground. :lol
You mentioned one side has slight pad movement when squeezing the lever, if it's just the pads moving then it points to the seals, but it might be worth taking a closer look. On a couple of occasions I've found the disc to be the cause of the problem, if it's warped (dish-shaped might be a better description) then the pistons use up a lot of lever movement to flatten the disc... that feels the same as air in the system (but is much more expensive to cure). :'(