Draw your bow back and have someone measure from 3/4" tp 1.5" out from where your rest makes contact with the arrow. Use a broadhead to make sure it doesn't contact the riser.

I use a 28.25" arrow with my 30" draw. These arrows were cut for a WB. However, I can cut another inch off for my QAD. So, there's no written rule on length except for making sure the arrow doesn't draw too far back and the tip touches the rest.

Plus, draw length is usually measured by adding 1.75" to where your hand touches the grip + distance to nock at full draw.

The 350's would betoo stiff for your set-up. Go with the 250's. Though the 250's start to get stiff for any arrow shorter than 26.5" long w/ a 100 tip. If you go to a 125 gr tip you can go shorter.