Yes, puts you over their recommended seat pressure and well under max over the nose.

Absolutely do as you wish but asking here and doing otherwise defeats the purpose of asking for suggestions in this thread.

Would love to hear how the lifter can't handle 180 on the seat when it's essentially unloaded but -can- handle 485 over the nose.

The excessive range for their specs does not lend credibility. 110 on the seat, wasting your money on a roller cam as it's probably unstable by 5k unless you're running ti valves/retainers and no lift.

Open, 280-485??? What is this telling me. Throw literally any spring at any installed height at it and you'll probably land within that range.