I'll start with one that seems impossible to beat: a 2c/66 spaceship that keeps shoving a glider into a block (it can reach it from infinity)!

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`x = 6, y = 3, rule = B3-ek4cejqtwy5ekry6ain7c/S02-c3-cqy4qt5aej6en`

2o3bo$2ob2o$4b2o!

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`x = 13, y = 9, rule = B3-ek4cejqwy5kry6an7c/S02-c3-cqy4qt5aj`

12bo$10b2o$11b2o5$2o$2o!