Minimum br required at NL 25 for a solid player at lower levels

[Ironic]

Hello, in your opinions what is the minimum br required at NL 25 for a solid player at lower levels. I play on PS full ring no limit.

My ptbb/100 is 14.98 over 12K hands. If I do go bust I can reload but it would be nice not to as I'm trying to see how far I can build my initial £20 deposit.

I am confident I am a winner at this level and not lucking out since I am not getting saved by the river etc or chasing straights, flushes with incorrect odds.
And all the usual bad beats have hit me etc but I just play through them.

So what do you guys think? Am I being greedy and foolish? I am aware of the 20 buyin rule...