Hi David,
Getting itchy fingers here - I guess still too early to start sowing for next year?
Yes, just a little, figrat. Those 'itchy fingers' could be your worst enemy...it suggests lavishing care that sweet peas just don't need.
What we are looking for is a spell of weather when there is still enough warmth to germinate the seed (50F) then for cold weather to set in to stop them putting on growth. If we start too early, the seedlings will just put on too much growth & become weak and leggy.
If in doubt you could always germinate the seed indoors in November (say an unheated bedroom) then transfer them into a cold greenhouse or similar as soon as the poke through.
PS. I'll start the new thread for next year's sweet peas (as promised) shortly.