hoolihitscan: cl_interp_ratio 2;cl_interp 0.0303
projectile: cl_interp_ratio 1;cl_interp 0
further reading: https://www.teamfortress.tv/52942/
The thread you linked recommends putting cl_interp on 0 so not sure why you are going against your own source. Also, I'd recommend using cl_interp_ratio 1 even on hitscan if you have a decent connection that doesn't drop packets. Higher interp ratios mitigates the effects of packet loss, but if there are no packet losses to mitigate it's not really necessary.