If you allocate 5% from the castor oil to olive oil, you may have less of a chance not liking the soap. Generally, most of us try to cap the castor oil at 5% or risk having a weird soap. It's a lot of hard oils you have there but it could still make a nice soap.
If you're curious and you want to do it, by all means, sate your curiosity. Experience is one of the best teachers in soaping and while 5% is the recommended cap norm, you can get away with 10% castor depending on your recipe. Were you trying to increase bubbles?
In regards to the castor, I'm guilty of being one of those that love using it at the higher end of the spectrum, from 8% to 11.5%, depending on how many hard butters/fats are in my formula. Personally, I'd have no qualms about using 10% castor in the recipe you posted.
I've never gone higher than 10% on butter content because I worry about it killing the lather but don't be afraid of 10% castor at all. Most of my recipes use a decent amount of hard oils (lard/tallow/palm) and I always go with 10% castor unless I want something that doesn't trace so quick. I've never had the sticky soap issue with 10% castor probably because it's balanced with the hard oils and butters like IL mentioned.