Palgin, the neoscrypt version you posted 1-2 days ago does in fact manage >1850kh/s on 1080ti. Your current version has high gpu usage fluctuation (between 60-98%, where previous version constant 98%), less power usage and kh/s about 1200-1500. Maybe you can take a look
I'll take a look, you're the second one reported that problem.
Anyway, Ti's will have separate kernel soon, but I'll provide a fix to this fluctuation problem ASAP.
UPDATE: check GitHub directly, I've added test binary for anyone who's experiencing hashrate drop after last update. Please, check it and provide feedback. Thank you in advance.