NYSHunter, your arrow with a supernock, an aluminum insert, and 4" or 5" feathers should weigh in at around 421 grains if you use a 125 grain broadhead. Plastic vanes will add quite a bit. They vary depending on the brand, but you will gain at least 10 grains over feathers.

You have gotten some good advise already, but I would suggest shooting some arrows through a chronograph.

I bet you are making more KE than you are giving yourself credit for.

I would opt for the 125 grain heads myself, if for no other reason, to loosen up the spine of your arrows.

Se if you can get a couple more pounds out of your bow, and make sure you can comfortably handle it.

Most important.....We want pictures! Of your elk, taken with your LX.