[porkynator]

1.
Scramble: R' U' F U2 B2 F' R2 D2 B L2 U2 B D' B' F' U' F2 U2 R B' L' D2 R' U' F
Solution: U' D L' D' R B' R2 L' F L F2 L2 B2 R2 U2 L2 D2 F' R2 F' R2 F D2 (23)

Spoiler (Click to View)

U' D L' D' //EO (4/4)
R B' R2 L' F L //DR (6/10)
(D2 F' R2 F R2 F') //HTR (6/16)
L2 U2 L2 D2 //3e2e2e (4-1/19)
D2 L2 U2 B2 * U2 L2 D2 F2 //2e2e (8-7/20)

* = B2 L2 F2 L2 B2 R2 (6-3/23)

2.
Scramble: R' U' F R2 B' D2 B' L2 D2 F' L2 F R2 F' R' F2 U' L' U2 F D' B' D2 R' U' F
Solution: D R B L D R2 D' L' D R2 F2 R D2 R U2 R2 D2 L2 B2 L2 B2 R D2 R' B' (25)

Spoiler (Click to View)

(B) D R B * //EO (4/4)
D //PDR (1/5)
F2 //Square + pair (1/6)
R D2 R U2 R2 //222 (5/11)
D2 L2 B2 L2 B2 R D2 R' //3c (8/19)

* = L D R2 D' L' D R2 D' (8-2/25)

So after the first 10 moves (insertion included) I had:
(B) D R B //EO (4/4)
L D R2 D' L' D //DR (6/10)

I played with it for a bit, with no luck.
The neat optimal finish was:
L2 D2 L B2 R' D2 B2 L F2 L' B2 D2 (12)

3.
Scramble: R' U' F R' B L' R' D2 R U2 L' B2 R' D B F2 R2 U L F2 U2 R' U' F
Solution: U2 D F' U F2 B' D2 F' B U R2 D' R2 U D2 L2 U2 R2 F' D R' F' R2 F2 (24)

Spoiler (Click to View)

(F2 R2 F R) //EO (4/4)
(D' F) //Simplify 3-1 (2/6)
U2 D F' U F [3e] //DR (5/11)
R2 U R2 D' R2 U [2e2e] L2 U2 //2e4e (8/19)

[2e2e] = U2 L2 D2 L2 U2 R2 (6-4/21)
[3e] = F B' D2 F' B R2 (6-3/24)

23, 25, 24 = 24.00