Brief, high G shocks (less than a fraction of a second) are easily tolerated compared to prolonged G loads that have enough to interfere with blood flow and the like. 46Gs isn't bad - USAF rocket sled testing exposed at least one volunteer to 80Gs.
That said, existing bioware and chemistry like Ancient history suggested ("Synthcardium, P4MO and Oxy-Rush") would probably help during turns. Oxyrush would be wonderful: you have oxygen-releasing storage vessels in the brain's blood supply. Who cares if the heart is pinned immobile for a 1-second, 30G turn?
Some of the ideas in Cyberpunk 2020 also look useful. The "distributed heart" bioware option isn't quite applicable (is that Chromebook 1 or 2?), but it points the way toward "upgraded arteries" that act as booster blood pumps. Fighter pilots squeeze blood out of their legs by clenching their leg muscles now - what if their femoral arteries were actually single- or two-chamber "remote hearts"? Ditto on the carotids.
Cyberware solutions seem obvious: a small tank of pressurized oxygen or other O2 storage method in the skull, with its own blood/O2 exchanger and maybe a pump. If you're fully rigged into your fighter, who cares about limb motions? You only need your brain to work.
Also, bonelacing (or that bone-enhancing genetech) might not hurt, especially if the extra mass isn't a problem because you're completely rigged into the vehicle. At some point in extreme G-loadings, you'll have to worry about your ribs collapsing.
Other bioware thoughts include a variant of orthoskin: reinforced body membranes. I've seen an x-ray video clip of a chimp in centrifuge (WWII German, of course). The blood was x-ray dyed so you could watch the heart move back toward the spine as the G-forces piled up. At some level of G-loading, that's going to get out of hand. Didn't Princess Diana die of a torn aorta in her crash? Some misapplied G-loading could be nasty.
Enhanced articulation would be useful just for its joint protection - it is supposed to reinforce joints in addition to making you more limber, right? Avoid high-G sprains with it.