i have tried every dry food under the sun and miss buffey tires of them after about 2 days

i just have not found a food she loves and wants to eat ... i cannot free feed her (because bentley is a huge piggy and would eat a 20lb bag of food if i let him

) and i can only give her about an hour in the mornings to eat because i have to leave for work ... i have even tried to smash up green tripe - she loves this - and add it into her food and she will will take each piece of food, suck the green tripe flavor off and spit it out
i know some people will add some karo syrup to dry food but i wanted to avoid anything really sugary because i do not want her sugar levels to spike and then heaven forbid something happen while i was at work
is there anything you can think of to add to her food that might make it more appetizing to her? maybe salmon oil?
i might have to go back to feeding raw - she LOVES that....i just felt my kids were always so hungry on raw even though i always gave them more than i was supposed to for their age and weight...thanks in advance for any suggestions!!