the only cart that compares to the sr71 is the sr74 lol. i haven't had a chance to try an okeanos myself but it runs kiss carts witch i'm not too fond of so load size and taste rebuild/reliability would be similar to the kiss cart you chose to put in it but slightly cooler size wise i believe...
The Persei can handle pretty much any concentrate depending on what cart you use I personally prefer the herc/nibbler combo for amazing taste and very large hits
Also from what I've seen of rosin it can be pretty clean so you shoulde t have any trouble with the kiss carts or kiss alpha either
The bottom adapter doesn't come with the XL or the 71 it's included with the sr74x I originally had used a file to add a groove to my 71 for a o ring until gary sent me a new adapter with my 8
I only recently got into vaping e-juice so don't own enough 510 stuff to have any spare parts but I'd be willing to bet I could make it work with the right stuff might need to order some adapters and connectors to test this
The sr71 and74 adapters can be taken apart if your careful, I converted my spring loaded insulator to the solid screw contacts so both my hercs can use the nibbler xl and work on the 8 without swapping insulators if your good with tools it might be possible to make a 510 threaded insert for the...
If your within the first year warranty submit a ticket on the w9tech webcite or pm @SamuraiSam to get your top repaired if your out of warranty you would need to buy the repair service on the w9 page
Basically as its heated the wax closest to the ceramic vapes that's is correct the buffer is basically slowly being refreshed wit each hit some of it is gone and new wax takes its place so you nailed it pretty much
As for the airflow if your wax is stable at room temp and you do enough cool...
Wispy unsatisfying hits can be caused by too much oil just as easily as not enough also and yes cooldowns are a must pulling air through till your confident your oil would be stable I'm a bit ocd about it tho and after 2-3 hits I'll do cooldowns till I feel no heat at all then store on it's side...