SS, my method of tiller (only because I can't see what's going on exactly during the floor tillering stage as some of the more experienced bowyer on here do) is"
First long string tillering. That is the string is TIGHT to the belly of the bow so as the bow has to bend in order for me to put it on the tillering tree. When I can bend it 6 to maybe 8 inches at my target weight I switch to short string.
Short string is 2 to 4 inch braced. When I get to 8 to maybe 10 inch at my target weight, I brace the bow.
NEVER pull the bow beyond your target weight.
All that being said, your tiller doesn't look bad. Get the mid 2/3 limb bending more. Don't scrape any more on the 1/3 near the handle until then. BRACE YOUR BOW NOW to see what it READY looks like.