Sefl oscillator smps frequency change + heat problem

I use ee16 kernel. Frequency: 54 khz.

The voltage drops when trying to draw power.

I put a small piece of paper between the ferrite ee16. Frequency is 114 kHz. Power is great. However, the output transistors get a little warm.

Is that how it works? Or is the core completely closed? Are you changing the primary secondary values ​​to increase the frequency?
 

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