My notes say those should be .38s, right? My guess is they will be just fine. An improvement over the oem .35s anyway (US 'H' spec).
What does 'light' mean? Besides, it's not all about the weight of the rider & his gear, but the riding style and conditions. The more aggressive the rider and the tougher the conditions the (generally) 'more' spring is called for. It's a matter of fit and balance.....not a particular number on your springs.
Keep your preload fairly low, especially if the spring is on the 'hi' side of your needs. I'd start at 5mm and maybe even experiment with less than that. That's a preload figure, NOT a spacer length.....that's clear? Sorry, don't know what you know, what you don't.
A 100mm oil level is generally considered correct. I like 110mm much better. That's a personal preference sort of thing. I just called the local (well..a couple hundred miles up the road) tuner that has done some work on my bike...he confirmed that 110mm (5wt) is fine by him.
You will be better served developing a set of opinions based on your own research/testing than doing what someone else tells you. In the case of that 'someone' being an expert in the field in question, maybe. My opinions are based on what I know (what I think I know sometimes) from what I've done and experimented with. Take care that what you read, hear, are told etc. at least makes sense to you. If it doesn't .... do some research to vet the answer or arrive at your own understanding of the matter.