G'day mate.
Having a short draw length makes arrow tuning very easy as you have a lot more arrow length to play with, but once you start cutting your arrows past 28 inches you can really stiffen an arrow up. I had this problem when I was first starting out when I researched what arrows I needed to start with based on the poundage of my bow.
The other thing to consider is that when talking about how much weight is on the front of your arrow, you also need to consider your insert weight, which it seems like you're doing. Most people will say "I'm shooting 250gns up front" for example and it is implied that this includes the weight of the point/broadhead as well as the components.
Ken Beck's video posted above is great. If you're after some more material to dive into, I've linked a video I made below.