I have this 7 foot table that is non slate, just MDF I believe. I know that nobody talks about these cheaps tables in this forum, and I understand why, but maybe someone would want to spend some minutes giving advice on how, if possible, do I get this table level. I believe the whole frame (not only the mdf surface) is warped in a way that center of table is a bit lower than the extremes, so trying to level the table with the 4 leveling things won't work. Any suggestions will be greatly appreciated. Thanks!