OK ladies, I need your advice again!

I've only had full time spots but, now thinking of offering 2 part time spots out of my 5 openings. I have a daycare family expecting and they are wanting to keep their little one with me part time.

I charge 170 week and was wondering what suggestions you have for part time rate. I would charge more as I'm giving up a full time spot and follow DNA and only have 5 spots in my daycare so I can't make up any income that I would be giving up to do part time.
Thoughts? Still thinking if this is the route to go...I just don't know if I want to juggle and miss out on filling UGH what to do!!