All roids increase creatine synthesis. But anavar maybe moreso than others.
Also there are some on here that think anavar may cause hypoglycemia...maybe anavar does something with insulin that also contributes to the incredible pumps and synergy with creatine.
I would try 5g of creatine 2x/day. I still don't think you need 20g-30g but as cheap as creatine is you can certainly try it.