Losing hay off pickup. Gathering wheels for Krone KR 160?

I have a Krone KR 160 that will lose hay off the edge of the pickup in heavy windrows. Raking with a NH HT152. The rake is narrowed up as far as it can go at the back. Any options for gathering wheels, or am I going to have to fab something up? Would it be worth the hassle, or just make smaller windrows?

Losing hay off pickup. Gathering wheels for Krone KR 160?