Ah that explains why with the TOT it fixed the over corrected center!
Tonight I pulled out my mirror for another go.
First I tried something I found on the net and that was TOT working the edge with small W strokes to lower the outer zones. Done this a few laps around but no real improvement, actually made the wavefront drop to 1/6 PV.
Pressed for another hour then done a few minutes the normal figuring strokes but with a few big strokes right over the center and brought the center of the mirror right to the edge!
This has worked great and the edge now looks much better....no TDE and the mirror looks very smooth right to the middle.
Done two tests with the mirror with the coudermask and put the info into figureXP..First lot of data gave me 1/8.8 PV...(20min after figuring) and the second test done 30min later gave me a even better readings and FigureXP now gives me close to 1/20 PV. I shall have to give it a few more tests when it cools down some more to get a more accurate reading.
But it looks like it shall be better than 1/8 PV..


Shall get some images posted tomorrow after some tests with the ronchi mask and the coudermask.
cheers Gary