6c/7 orthogonal, 40 cells. Based on the frontend of the puffer found by A for Awesome

`x = 13, y = 10, rule = B2ac3ae4ar5ceiq6ai/S02i3ain4aqr5cikr6i`

b3o5bob2o$3bo4bob3o$o5bo3bo$2bo6b4o$9bo$9bo$2bo6b4o$o5bo3bo$3bo4bob3o$

b3o5bob2o!

I found this with a slightly modified version of ruleSearch-matchPatt.py which I hope could be used to find stabilisations (both in rule and pattern) of other frontends with unique speeds. I tried it out on the (5,1)c/8 frontend - also posted by A for Awesome - but that rulespace seems to be a bit too explosive for this idea to work. Here are some results from application to the 4c/5 from the database:

smaller 4c/5 orthogonal, 17 cells

`x = 10, y = 7, rule = B2ac5a/S01e`

6bo$b3o4b2o$o2bo$3bo$o2bo$b3o4b2o$6bo!

smaller 8c/10 orthogonal, 15 cells

`x = 9, y = 7, rule = B2ac3n4rt5jqr/S01e3y4k5r6i`

5bo$3o4b2o$2bo$2bo$2bo$3o4b2o$5bo!

12c/15 orthogonal, 11 cells

`x = 8, y = 7, rule = B2acn3cy4kt6c/S01e3k5e`

o3bo$2bo3b2o2$bo2$2bo3b2o$o3bo!

16c/20 orthogonal, 16 cells

`x = 15, y = 7, rule = B2ac3n4q5jnqr6ce/S01e2n3ky4ky5r`

11bo$6b3o4b2o$8bo$o7bo$8bo$6b3o4b2o$11bo!

20c/25 orthogonal, 17 cells

`x = 11, y = 7, rule = B2ac3cn4ry/S01e3cqy4c5y`

o6bo$2b3o4b2o$4bo$4bo$4bo$2b3o4b2o$o6bo!

24c/30 orthogonal, 17 cells

`x = 10, y = 7, rule = B2ac3cn4c5jqy6c/S01e3qy4cq5jy`

bo4bo$ob2o4b2o$3bo$3bo$3bo$ob2o4b2o$bo4bo!

32c/40 orthogonal, 25 cells

`x = 20, y = 7, rule = B2ac3a4ckrty5nq6e8/S01e3y4cr`

9bo6bo$6bo4b3o4b2o$3bo9bo$o3bobobo4bo$3bo9bo$6bo4b3o4b2o$9bo6bo!

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There are currently many light speed periods with no example in the database. These ships from my own search results fill a few of the gaps, though I'm sure that there are more already known.

14c/14 orthogonal, 5 cells

`x = 5, y = 3, rule = B2acn4cy/S`

obo$4bo$2bobo!

16c/16 orthogonal, 10 cells

`x = 9, y = 7, rule = B2ac/S`

o7bo$8bo$o5bo2$o5bo$8bo$o7bo!

24c/24 orthogonal, 16 cells

`x = 11, y = 7, rule = B2acn3ry4iyz5e6i/S`

2bo3bo3bo$obo5bobo2$obo2$obo5bobo$2bo3bo3bo!