Looks pretty high, If your afraid the current is still to strong you can try stuffing extra sponge in the the actually filter hanging on the back of the tank,
I keep extra sponges stuffed in mine for future tanks, It may also aid in slowing the flow more,
The sponge you put in the nozzle end was stuffed full? Needs to be stuffed in there fairly tight Covering all the hole openings...
That in itself should have slowed to flow down drastically..
Took all mine from a killer current to this