Personally I would submit with 75 pts so you're hopefully set for an invite later in the year, estimates pinpoint an invitation of around October / November (volatile estimate, subject to change!). Even if the partner assessment came in today and you submitted an EOI with 80pts today, you're unlikely to get an invite before July / August.
When your partner's assessment comes through, you can update the EOI and hopefully get an invite sooner, and if the partner assessment hits an unexpected road block, you'll be safe in the knowledge you're already set up as much as you can be for later in the year.