The lowest SER I got with a positive response, having first solved the singles, was a SER 1.7. This was a severely down graded form of JEXOCET, having no interest
Here is a list of puzzles in the range 7.7 to 9.6 (SER) with a more classical JEXOCET form. I checked the first (rating 7.7), it is a basic JEXOCET.
One appears with a double exocet (I did not check the PM)
The sample is highly biased (pattern game ...) but the ratio of puzzles having a JEXOCET is relatively low in that lot of a little more than 10 000 puzzles, far from the 80% seen for "potential hardest" puzzles
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5..........46..9...8..4..1..2.9.6.....6.7.3.....3...2..1..2..5...9..37..........8; ;1;1;r4c5 r6c5 r2c6 r8c4 158
1..........23..1...4..5..6..6.7.5.....8.6.9.....4...5..8..4..9...1..23..........7; ;1;0;r5c4 r5c6 r6c2 r4c8 123
4..........57..6...1..5..2..8.6.9.....3.7.9.....3...4..2..8..1...7..35..........2; ;1;0;r4c5 r6c5 r2c6 r8c4 124
4..........97..6...1..5..2..8.9.6.....3.7.9.....3...4..2..8..1...7..38..........5; ;1;0;r4c5 r6c5 r2c6 r8c4 124
8..........72..3...1..4..5..2.6.9.....3.7.6.....3...1..5..2..8...6..79..........4; ;1;0;r4c5 r6c5 r2c6 r8c4 158
..1.....2.3...4.5.6...7.8.......9....7..5..3....3.......2.4...1.4.5...9.8.....6..; ;1;5;r4c5 r6c5 r2c4 r8c6 1268
...1.2.....1.3.4...5.6....2..7....89....7....34....7..7....1.6...4.9.8.....5.8...;D;2;44;r4c1 r4c2 r6c5 r5c7 1256;r6c8 r6c9 r5c3 r4c5 1256
1..........23..4...5..6..7..6.1.4.....8.3.1.....8...9..9..2..5...3..82..........7; ;1;0;r4c5 r6c5 r2c6 r8c4 579
9..........47..3...1..2..5..8.9.6.....3.7.6.....3...1..2..4..8...6..74..........5; ;1;0;r4c5 r6c5 r2c6 r8c4 158
..1.....2.3...4.5.6...7.8.......3....7..5..9....9.......2.4...1.4.5...3.8.....6..; ;1;5;r4c5 r6c5 r2c4 r8c6 1268
..4.....7.9...8.1.6...1.2.......3....5..8..9....5.......2.9...4.8.3...5.7.....6..; ;1;5;r4c5 r6c5 r2c4 r8c6 2467