What motor do you have?
How is your boat weighted? What bags do you have in your boat and where?
Have you ever burped your bags?
Have you calibrated your speedo?
I don't have enough information above to truly answer, but here are some common things to look for.
#1 - That boat likes weight up front. People tend to weight the back to heavy and that will lead to your exact issues. Slow out of the hole and steep wake that will crumble or wash.
#2 - Make sure you burp the air out of your bags regularly (especially your front bag). They will take on air from driving while trailered and while they still look full and feel full, but if you unscrew your top plug you will burp half of it out in air. Hence, you will be running too heavy in the back and will give you slower hole hole shot and the wake will be steeper and crumble easier.
#3 - Check your speedo by calibrating it with a handheld GPS. You can even use your smart phone nowadays for that. The speedo is often off and you are going much slower than you think. Try speeding up a bit too.
#4 - Depending on which side you are seeing more wash, then add more weight over there. Assuming it is on the port side, which is common, then move one of your passengers over there in slow increments and see if that helps. Also, speed up a bit as noted in #3.
#5 - Yes a prop will make a huge difference regardless and check with OJ and ACME and it will be worth the coin. I think the recommended prop from OJ is 14.25 x 14 or 14.5 x 14.25, but double check with them.