My septic leech field is creating higher water table between field and house

Hi there:
I have problems with high water level in my septic tank and water not being distributed into my septic field lines that is partly causing a higher water table at the back of my house. The water has yet to back up into the house but it gets iffy when it rains a lot. I have a double chamber 400 gallon tank - too small for 4 people. I have access to my tank and distribution box. Is it best to wait for summer in order to try and treat the field? Should I buy an air filter and place in the distribution box and start adding bacteria to my septic tank. I'm going to install a drain to take excessive runoff from the house away from my back yard. I have had estimates for a rebuild and it would cost me 40,000 to fix. Yep 40,000.
I'm not sure weather to buy composting toilets, and try to do a quick fix by digging a few new lines and wait to see if the old field can restore itself. Where do I begin???? Any help would be greatly appreciated. Tweet