15% quality difference generally means the weaker side needs more numbers than the better side to stand any chance. Playing with 3 attackers is very likely to lose.

4-1-4-1 or 4-1-3-1-1 could be more viable to get a result. Push up both DL & DR and maybe put down-arrows for all defenders.

Depending on your resources, it may be worthwhile to spend 1 to a few T to get a close-to-90% GK with PK stopper SA. At least you could stand a better chance if it gets to the late stage and could still hold out (plus a similar 90%~ AMC to take those few counter-attacking chances [ST is too expensive at this stage, while single-position AMC should not attract too many bids]).

All the best of luck for your CL final tomorrow.