Jim, I saw a setup like your talking about tonight, it uses an A1000 through a regulator that I think was set at 30 psi and it returns from the regulator. It then goes to the 7100 with an 8 AN line and uses a stock return line, I don't like them because I'd had one bust one me but it will do for now, I'll change it over to the banjo to 6AN like mine..... much better.
Yes your 35 psi should be fine.
Jim