Hi yixi,
Thanks for letting us know what you ended up deciding … and congratulations on your new mattress 
As you know I think you made a great quality/value choice.
As you also probably know there will be a break in and adjustment period with any new mattress so I would wait a few weeks before making any changes or additions to your mattress (see post #3 here and post #2 here).
It may be worth talking to SleepEZ as well about your low profile foundation as well to see if they can do anything for you.
Phoenix