so this size probably wont fit the 49 port hubs nicely (if I dont want to skip alternate port)? any idea?
You'll have to skip every other port as I have done with the Furies on the ASICMiner 49-porter. There's no way around it.

Did you save your old .336 asicminers ? if so swap the sinks, and sell the old .336 models on Bay with a big FOR OVERClockers HeatSink in title.
They will do well. Pretty sure the old stock of sinks ran out is the issue, as a USB port is a far bigger loss in efficiency than a few MHZ more per miner, resister or not.