That was a crazy scramble! My 'optimised' solution z2 // inspection R U' R2 D' R F2 L F2 L' U F2 // xxxcross U' R U' R' U' R U R' U' R U2 R' U R U2 R' // 4th pair + OLL R' U R' U' R3 U' R' U R U R2 U2 // PLL