If the lines you used were too stiff they won't seal properly and will drip ever so slightly but over time it will add up.  I fought one ski before I got it all sealed up.  Put a white paper towel under there to see what was leaking then go back and check.   I suspect you have a hose leak or fitting.   I am still looking for a source for the OIL lines other than Seadoo (8mm and 12mm I believe).  They are awfully proud of those hoses $$. 
Clean the bottom up real good and lay down some paper towels.  Good Luck !!