Hi Roy
Your gear sounds like an iQ setup which is for course racing... so I'll assume you want to go fast downwind. In Swell.
This is all about ToW and experience. Going slow in swell is not necessarily safer as you will go over the back of a wave and out, or up the back of one and catapult anyway!
Read the swell! Look at the patterns in the waves and anticipate when you will be too high or too low and adjust in advance. Watch out for cross chop as the waves power can add up and send you higher than the last 3 regular swells.
There are a LOT of ways to get the nose down!
1. Front foot down pressure
2. mast down pressure from front hand
3. mast down pressure from back hand (sheet in, nose down! and bonus, over-sheet for less power!)
4. back foot heel down for windward rail down. Foil at an angle has less lift than a flat foil
5. leeward rail down - and turn downwind as much as 30 degrees!
6. harness pressure down through the mast
7. wobble the foil (trust me it can help)
8. harness weight forward - move hips on long lines
My first 30kt run was in 10cm chop and I was SCARED! it felt huge.
Last month I did 27+kts in 20cm-1m swell (reaching). GoPro's really don't do wave size any favours!
gpsteamchallenge.com.au/sailor_session/show?date=2022-10-18&team=33Or 24kts in max 30cm swell during a course race.
gpsteamchallenge.com.au/sailor_session/show?date=2022-10-29&team=33Practice going fast whenever you can! It gets easier, but no less scary!