La. bowhunter, I'm shooting a Patriot at 40#, and it needs 60-65# shafts at 28" length. For a two inch longer arrow you will need to go up 10#, and for the 15# more draw weight go up another 15#, which puts you at around 90#. This is based on bare-shaft tuning. When I put the 61# limbs on, I shoot 90-95# shafts at 28", using a 160 g. broadhead.
The Patriot is a very hot bow, and needs surprisingly stiff shafts. My FF string is a skinny one, and if yours is bigger (16 strands or more) you can back off 5# or so. You can also build out the sight window to reduce spine, if you have trouble finding the higher spines. You can also "detune" the bow by adding a relatively heavy bow quiver, or putting on heavy rubber string silencers.
I once bare-shaft tuned a guy who had three sets of rubber spiders on the string of his Patriot, and when we cut them off his spine requirement went up about 20#. Adding weight to the string is a sure way to reduce the spine requirements of your bow.
All of these factors are at least some of the reasons that we see big differences in what works for individuals shooting similar draw weights.