1stock240

Let me take a minute to thouroghly explain my situation. I have an S14 and recently did a 5 lug swap and added some G35 18's. I wanted to eventually do a z32 brake swap as my horsepower goal in the future will be around 300whp. This car will mostly see daily driving duty. I want it to be fun but want stopping power when needed. I already have a z32 parts car. It is a 90 NA that was mfg in late 89 so it has 26mm aluminum calipers. Another reason for wanting to change is I have issues with my s14 master cylinder. My rear pads wear down and have to be changed every 3-6 months where as my fronts are still thick. I think I have a proportioning valve issue. I bought rear calipers a year ago thinking this was the problem but like I said it is not. I am leaning towards just rebuilding the front z32 calipers and doing just the front upgrade as to not mess with the ebrake. The car is not for drifting and if it sees a track it will be for just fun. Oh and my car is currently auto so has bigger brake booster.
My questions are these. Just 26mm z32 fronts and stock rear setup.
Do I need to upgrade master cylinder? I heard conflicting opinions so far.
Stainless lines needed?
With just 26mm fronts will the bias be as far off? Most with the 30mm calipers say that rears need to be done as well. I am trying to avoid the rears if at all possible. I need some brake work anyway and with the other z32 parts car I am thinking this is the way to go to keep it simple and effective.