15% would be around 342hp then, and that's a lot more realistic considering the build, with lots more rpm to go.
I suspect but hope not, that the Kinetix will be the bottleneck as you head towards 400hp+. I hope not as I also have it, but from the parts you have it's the only unproven thing at this level of power/rpm flow.
Tbh, even my bolt ons DE with VCT running only comes alive around 3250rpm and up. If you look at dynos of older engines without VCT, you'll see a torque 'hole' below 5000rpm you'd not have on modern n/a engines. I looked up my old Clio F7P graphs the other day - that thing was like it had VTEC/ VVEL, the change was so dramatic around 4500-5000.