I do not consider myself an IG whale by any means.
I've tried the groups in the past but I personally don't like relying on other people for account growth/engagement. This is not to say that they do not work though and/or help people.
And no, I do not powerlike myself with the bigger accounts.
I have not personally experienced any instant ban when adding links to my accounts, I think this largely is dependent upon the type of cloak you use. As for the prelander, I don't believe this does anything to stop instagram's crawlers, but may delay them. As long as your method for hiding the link is good, then you don't need to worry about a prelander.
I warm up my accounts by profiling everything day 1 (including link, bio, name, username). On day 2, I will follow 50 and increase by 50 every day after that until 600.
Daily following allowed: I have personally not tested the max settings for daily following, I like to keep things safe at 600 a day for fully warmed up accounts.
Daily likes allowed: I only like a very small amount per day - only to make the accounts look more "human like"
Unfollowing I use the exact same settings as following but I wait 7 days before unfollowing.
hope I answered all your questions!
About 75% of my accounts are blackhat cpa spam and the other 25% are 'legit' accounts growing on the side.
My monthly bill is expensive, but there are seasonal recurring discounts and I also believe it's a tax write off.