Hi Nicole,
I don't think it's a nutritionist you need really they won't help you with you insulin to carb ratio as everyone is different. Your DSN should help you with this. Have you been on a DAFNE course? This will help to fine tune your ratios.
Keep a diary, work out if the ratio is right and tweak it if not.
Exercise again is very individual, only you can work out the impact, for some it raises, for some it drops it.
It's bloody hard work and even though I've done all of the above, it's still changes all the time and for me what works one week doesn't always work the next.
Have a look at the low carb forum on here, I don't officially low carb, I'd say I'm a medium carber so I can't advise on that but there's lots of info.