I completly understand your time issues being a SAHM, my 3 kids with special needs take up a huge amount of time and the only days I can work are weekends when DH is home.
By going for definition and not size your routine should look more like a strength routine rather than a mass building routine to ensure that your not loosing that muscle during your cardio. Diet and cardio should take care of the fat loss to get the definition you are looking for.
A good routine should have around 5-6 exercises in it and be able to be finished in under an hour. Heavy squats and heavy deadlifts usually shouldn't be done on the same day, on a day with heavy squats do light deadlifts at a high speed to develop explosive power and work the ATP energy system preparing you for a better pull from the floow when do your heavy deadlifts. Do light squats on the day that heavy deadlifts are done for basically the same reason as above.
Your style of doing deadlifts and squats will effect the muscle focus but remember both squats and deads work a large preportion of the muscles in the body. (I squat with a close to normal stance but deadlift with a sumo stance)
reps, sets and timing
12 should be the max number of reps your doing unless you are aiming for endurance. for strength and power sets are idealy in the 8-12 range for beginners and 2-3 sets. for light sets a 1 minute rest is good bot for heavy sets you are looking at a 3-5 minute rest between sets. Slow reps are good except when you are working on the light sets with explosive speed concentrating on perfect form.
Hmm a couple of calculatons
at 155 lb that makes you 70 kg with an estimated BF% of 26% (it would be good if you could get caliper measurements done at the gym)
a strength training athlete needs 1.2 - 1.6 gram of protein per kg of lean mass so
52 X 1.6 = 83 gram of protein
it looks like you are already getting plenty of protein so don't panic over needing to eat more, eating extreme amounts of protein beyond what you need can cause health problems.
Just as an example one of my "squat days" in the middle of a training period would look a bit like this, 3X6 Squat, 3X6 Hamstring Raises, 3X6 Calf Raises, 3X10 Back Hyperextensions (on roman chair holding weight), 10 X 3 dynamic deadlifts. reps and weights would change according to my peaking program. this formed part of a 4 day split. (Squat Day, Tricep and shoulders day, Deadlift day, Heavy Bench day)
MMMM nuts

nuts are a great source of protein but usually put my fat grams up to high.