I've never flown a 310, but my generic technique for a light twin would be:
- Full flap (obviously)
- Speed not above 1.3 Vs at threshold (this will be well below blue line in most)
- Normal approach angle (definitely not shallow) - bleed off more speed in round out
- In a Seneca I would have the power off before crossing the threshold allowing a good flare (close to full aft elevator at touchdown),
and touchdown at a point just after the threshold.
The idea is to be as slow as safely possible, and touchdown as close to the arrival threshold as you are comfortable with. I've seen a lot of light twin drivers who have some fixation with blue line on approach, that is normally way too fast, and once you're committed to landing, blue line really doesn't mean anything.