Subwoofer boom is too much for me...

Well, I have to say I took two washcloths and stuffed them into the ports of both my subwoofers and there is a big improvement in sound.

I have subwoofer in from DAC amp and out to bookshelf for both channels.  Sounds great now.

I still think a good pair of floor-standers would sound better, but for now, I'm happy.

1) Auralex Lenrd bass traps from floor to ceiling in the corners of front wall (see pic in my virtual system)

2) An isoacoustics or ASC stand for your sub 

3) The DSPeaker 8033 sub eq device

This has worked for me every time I've set up a sub, whether it be REL or another brand. The idea of keeping the crossover as low as possible while volume high was tough to swallow at first, but now makes sense. 

Subwoofer tuning

And yes, I have bass traps and such. 

Something like this is better. Available in most size.

 

less likely your port is the problem and more likely you have incorrect slope and x-over frequency relative to your main speakers. fixable to a certain extent.