looking at the boat specs, you appear to be a great weight for it @ 75 gallons and 8' long.
i have two boats, one in which i am at the lower end of the spectrum and one where i am at the upper end and both work great for me. if you were right at the high/low cutoff you may have some fitting in issues but you shouldn't in the diesel d75.
sit in it before you buy it and if it feels good, snatch it up. the seats can be moved forward or backward based on your height and you have fully adjustable bulkhead and thigh braces as well.