Log Cabin Floor levelling

I can’t decide which flooring option is best for a 5m x 3m log cabin I have built. The cabin is laid on a 15cm thick concrete pad but the pad has a deviation of 10mm in places. There’s a bit of a hump in the middle as it chucked it down with rain as it was being poured and I didn’t get it perfectly level.

i will be laying 2x2 floor joists with 18mm ply and probably tiling it. There will be a hottub placed on the floor so it needs to carry some weight.

The question... am I better using self-levelling compound to get the floor level, or would I be better using shims under the 2x2 to level it?

 

You could try Broadfix plastic shims, they won't rot. screwfix do them.

Blup