Keep 13 weeks AND 10% burn mechanism
Although I'd most likely go 4 weeks and 10% I feel like that's too much at once and instead a small change of the 10% punishment to instant withdraw. The 13 weeks now makes that 10% more valuable in my opinion. We can see how that goes for 6 months and then based on results try 10% plus 4 weeks and judge results again. Incremental steps.