spindles dont lose you lift, the amount the bag compresses and expands determines lift. if you have drop spindles and when layed out the bag is not fully compressed then you are losing lift, but its certainly not the spindle losing you lift. also bag placement in relation to the pivot point (lower arm bushings) is very important.
just for your info, I make tube arms for Mazdas that fit toyota spindles and eliminate the strut rods. check the Toyota ones at the website. the Mazda ones are very similar.
www.builtbybyc.com