1 year with Bondora Strategy #3

I have started investing in Bondora in August of 2015 and noticed that loans that default, usually default on first payment. Therefor I came up with strategy #3: invest in HR (high risk) loans, with interest rate 50%+

After almost 12 months, i have following results:

Total loans  523 (473 not repaid yet) loans purchased, with 5483€ of principal and 73% interest rate.

Defaulted 109 loans, with principal of 1388€ and interest rate of 75%

So it comes that only 25% of loans defaulted during first year with average interest rate of 74%.

On one hand it seems it should make extremely good returns, but on the other hand the current cash flows does not add up. If i count the cashflows in a simple diminishing way and multiply it by 5 years, the total amount returned will not generate return an might have negative return.

p.s. how do i chek what return i have made on repaid loans ? (523-473=50 repaid loans)

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I do not find an answer if my strategy is good or bad.  I even tried manual XIRR calculation suggested by P2P-Banking for all of my portfolio, and I got following results: