To me the tiller looks pretty solid. I’d probably take a couple scrapes mid limb on the left - there is something difficult for me to put my finger on that my eyes keep coming back to in that spot. I tend to keep the bend a little more out of my fades than you have it on your left limb but I think this is more preference than anything. However, might be what is causing the difference from strung and drawn tiller.
You might try hand tillering it from here though (photograph the bow drawn in your hand and tiller off of that). How the bow sits in your hand and how your fingers grasp the string will change the pressure point from where it sits on a tillering rack and with a single hook drawing it, which will change how it ultimately bends. I am a believer that at this stage you can learn way more by feeling the pressures in your hand, combined with photos of the bow drawn than you can from even the best designed tillering racks.
The last thing worth mentioning is that I think you are right in considering trying to correct the strung versus drawn tiller. I can’t say with certainty, but i believe this sort of issue affects limb timing on self bows. Limb timing issues will effect nock travel which creates its own issues on arrow flight. This may be an issue, it may not, but you won’t know until you’re shooting it. And that is also just my theory!
I’m excited to see this bow! Keep up the great work and keep us posted.
