The addition with var at the current doses with the other oils is plenty, keeping the nandrolone where its at for what I assume is therapeutically purposes is great IMO. Increasing you dosages now and adding a different compound that you're unfamiliar with could be a waste of your time. You're just going to throw your serums higher and possibly get more sides at first compared to anything else, at that point it would be hard to gauge things. You have time down the road for starting a fresh cycle with higher dosages using test/nandrolone. Get a feel for var, its not fireworks like dbol, yet it can be fantastic if used in a ideal environment. There's nothing wrong with staying where your oils are at the moment while tinkering with var for the last 6 weeks or so.
Let your levels balance out a bit away from the dbol, which throws your estro in all sorts of directions erratically, that's no fun and can add issues with the increased dosages of the other oils if you went that route, even once you stop the dbol, you could have a higher estro level because of it. No need to rush and ramp things. You want to learn and get a feel for it correct? Well, put yourself in a good position for the learning experience without other influences or disorders.
What's the hurry? Have fun.. It's all one big science experiment at the end of the day, for all of us, treat it like one and take notes..