So, how I've been taming them without a skiff is figure out how many cannonballs it'll take less then or equall to 4 place down four cannons or 3 or how many itll take more then 4 place half the amount down (6 cannonballs/ 3 cannons, 5 cannonballs 3 cannons) load them up find your space whale gain aggro and run straight at the cannons (grappling hook helps for getting to cannons) the fire all as quickly as possible for 4 shots, for more then 4 fire them all (3 for 6 etc) reload and fire again as quicly as possible
Singleplayer taming is so hard. I had nobody to aim the cannon, and I'm currently waiting for the astercetus to wake up. I struggled so hard. He's a blue level 8. LEVEL 8. Dododex says there's a 93% chance of death for the cannon for a level 8.. Pretty lucky, eh? Singleplayer taming is.. Hard. Not impossible, though. I managed!
Don't use mek because the astrocetus takes first the torpor and then the damage. The effectiveness will go down.
We tamed a 130 with mek and Kibble and get a 136 -.-
I think the stronger the weapon the more you loose the effectiveness, so the "best" way is to knock out with rocket launcher.
It's the same effect with rock elementals.
Wildcard should repair that.