These are the original and unoptimized forms.
Middleweight volcano, with help from MathAndCode:
x=46, y = 41, rule = B3/S23
21bobo$21b2o$22bo2$7bo$8bo9bo$6b3o8bo$17b3o6$2bo$3bo19bo14bo2b2o$b3o
19bo5b2o6bobo2bo$21b2ob2o3b2o6bobobo$36b2obob2o$19bobo3bobo7bo2b2o3bo$
19bo7bo4b2o2bo4b2obo$17b2o9b2obo2b2ob4o3bo$19bo7bo4b2o2bo4b3o$19bobo3b
obo7bo2b2o$36b2obob5o$21b2ob2o3b2o6bobo2bo2bo$23bo5b2o6bo2bo$6b2o15bo
14b2o$5bobo$7bo$bo$b2o$obo2$17b3o$6b3o8bo$8bo9bo$7bo2$22bo$21b2o$21bob
o!Star with block(s):
x=28, y = 28, rule = B3/S23
6bo$7bo$5b3o$12bo$13b2o$12b2o9bobo$23b2o$24bo4$13bo$12bobo$13bobo$14bo
bo$10b2o3bo$9bo2bo$5bo4bobo$4b3o4bo$2b3ob3o$2bo5bo16b2o$b2o5b2o15bobo$
2o7b2o14bo$b2o5b2o$2bo5bo$2b3ob3o$4b3o$5bo!Trice tongs variant:
x=29, y = 29, rule = B3/S23
23bo$23bobo$23b2o2$15bo$14bobo$14bobo$15bo$12b3o$10b3o$9bo$9bob2o14b2o
$8b2obo14b2o$8bo5bo13bo$5b2obo4b2o$4bo2bo$5b2o7$3o$2bo$bo$12bo$11b2o$
11bobo!Caterer with tagalong:
x=47, y = 34, rule = B3/S23
37bo$37bobo$37b2o$20bo$18bobo$19b2o$2bo41bobo$obo34bo6b2o$b2o32b2o8bo$
36b2o$11bo$12bo$10b3o5$33bo$9bo22bobo$9b2o12b2o6bobo$8bobo12bo7bo$26bo
5bo$25b2o2b4o$29bo$30bo$29b2o$25b3o$23bo$9b2o12bo4bo$8bobo13bo$10bo15b
2o$27bo$27bo$27bo!Stillater variant:
x=65, y = 51, rule = B3/S23
64bo$62b2o$63b2o7$16bo$17bo$15b3o5$48bo$47bo$obo34bo9b3o$b2o34bobo$bo
35b2o3$17b2o$18b3o3b2o$16bo4bobobo$15bob2ob2obo$15bo2bobo2bo3bo$16bo3b
o2bob3o$17b3o4bo14b3o$15bobo7b3o11bo$15b2o11bo3b2o6bo$27b2o2bobo$31bo$
30b2o8$2bo6bo$2b2o5b2o21bo$bobo4bobo20b2o7b3o$31bobo6bo$41bo$10b2o$9bo
bo21bo$11bo20b2o$32bobo!Stillater variant:
x=55, y = 49, rule = B3/S23
41bo$41bobo8bo$41b2o9bobo$52b2o4$6bo$7bo$5b3o3$40b2o$3bobo21b2o12bo$4b
2o20bo2bo8b3o$4bo21b3o4b2o3bo$24b2o7bobo$23bo3b2o5b2o$6bo17b2obo$7b2o
16bobobo$6b2o9b2o4bo4b2o4bo$17bo5b2o8bobo$19bo4bo9bo13bo$18b2o3bo4b2o
17b2o$22bo5bobo16bobo$21bo7bo$20bo$19bo17b2o$19b2o16b2o$46b2o$46bobo$
46bo3$3o23b2o$2bo22bobo$bo25bo2$18b3o$10b2o8bo$11b2o6bo$10bo2$25b2o$
25bobo$25bo$9b2o$8bobo$10bo!Unnamed P3:
x=57, y = 66, rule = B3/S23
18bo$19bo$17b3o3$11bo43bo$9bobo42bo$10b2o35bobo4b3o$47b2o$48bo4$43bo$
32b2o9bobo$32b2o9b2o2$32b2o$31bobo$31bo$28b2obo$24b2o2bobo$23bobo$22bo
bo$18b2o2bo$18bobob2o$21bo2bo$22b2o3b2ob2o7bo$13bo4b2o7b2ob2o7bobo9b3o
$12bobo3b2o19b2o10bo$12bo2bo6bo29bo$13bobo5bobo$14bo5bo2bo$21b2o$17b2o
$16bo2bo$17bo2bo$18b2o4$43b2o$43bobo$43bo$3o33bo$2bo32b2o$bo33bobo2$5b
o$5b2o24bo$4bobo23b2o$30bobo2b2o$35bobo$35bo$8b2o$7bobo$9bo7$41bo$40b
2o$40bobo!Cuphook variant:
x=36, y = 42, rule = B3/S23
5bo$6b2o$5b2o$15bo$14bo$14b3o3$5bobo$6b2o$6bo4$4bo$5bo15b2o$3b3o15b2o
2$34bo$18b2ob2o10bo$17bobob2o10b3o$17bobo$16b2o2b3o$17bo4bo$16bo$16b2o
4$31b2o$31bobo$31bo8$2o$b2o$o!