The apr % you see is for the full value of your pool..
So to get to these numbers
If you have 100% superfluid staking on the osmo half of the pool but the %apr shows for the full value of the pool the apr would be around 38% half of the 76%staking apr.
2/6
So when calculating etc you can use the 38% for the full value you have in the pool.
So to get to 19% again its a matter of halving the 38% to 19% (because only half the $osmo is fluidstaking) then to calculate what you get you add 19% to the overall value of the pool
3/6