House slowly sinking - an urgent fix?

[Andrew Grisdale]

HI, I bought my first house two years ago. House was built in 1953.  I notice some cracking and sticking doors. Had a couple of experts out so far. Both determine house is 3" lower in one corner compared to the far corner.  Foundation seems to be fine, but house is on clay soil which is causing the problem. 
One expert thinks 3" over 70 years isnt that bad. He suggests first coming up with a new drainage solution and seeing how it goes. Second expert says I need push piers and smart jacks and is quoting a gigantic $44k. Seems an awful lot to fix some cracks. Anyway, 44k not an affordable solution. Not sure what to do here. 

Will keep talking to experts but wonder of anyone has any advice? Let me know if you need more info.