I think another option may be a custom tubular manifold but that's [emoji383][emoji383][emoji383]. What about the atp manifold doesn't cut it? I remember reading some stuff about them being sub par but I wasn't sure why.
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It doesn't flow as well...and the issue with poor flowing manifolds is not only slower spool but also EGT issues. Because the manifold can't get rid of the hot air as quickly it's going to run a lot hotter.
FFE/PPT/APR are your only real options. RAI has a kit but I've heard of quality control issues with them plus they only do in-house installs they won't ship you their kit.
Also FFE/PPT kits are the same in terms of cost (~$5K). FFE's manifold isn't custom per se, they are all built to order but they have the machines jigged for production so you if want one you just buy it and they'll build it and ship it to you.