Great news confirming the mods. Yes, you are right, the nearby resistor to 8% resistor gives about 5% overclock as well.
How I did 133MHz? I used so called turbo-PLL circuit, which is a Japanese originated overclocking trick. You chance the 14.31818MHz standard XTAL of the clock circuit with faster XTAL. But then you have to feed correct reference clocks to the main board from a "piggyback" clock generator . It is a trick that serious overclockers use. There is not so much room for the piggyback in a laptop, so I used the PCMCIA cage to host the extra clock generator and fed the clocks by wire for the mainboard. I didn't get 24/48MHz clock working reliably by wires so USB does not work correctly if I use the turbo-PLL. I still have turbo-PLL installed in my TP600E but I run it now everyday with 108MHz FSB.
With this 700MHZ PIII I have now, the fastest speed it run stabile was 833MHz. But now it won't run at higher multiplier anymore (due to unlucky visit at 600X motherbord)
I am looking to find a cheap 850MHz PIII-MMC2-processor to try to hit 1 Gig.
obviously your at the forefront of tp600 developments,priviledged to communicate with you,that pll trick certainly requires absolute surgical skills,i have 2 tp600e,p111@702+p111 celeron @486mhz,both running @108fsb +really im impressed with the improvement the celeron gave over the p11 400 really,at his stage i'm trying to work out why pleap control panel fails automaticaly load the cache at startup ,it comes with a failed to load etc at start up in xp ro,so what i done is uncheck the enable at startup on the menu +now it boots with no startup errors +then i just click on the icon to trigger the cache,did you have this experience with the software? 
that 700 cpu you got, that wont revert to the full speed since you installed on the 600x have you considered tempoarily removing the cpu+revert it back to speedstep active + replay the procedure again?
definetaly the lower the voltage is the way to go on notebooks,however is there a way i can lower voltage on my p111 speedstep module without it reverting back to the slower speed?if that can be done that would surely benefit the battery side of things,thus make the package nicer overall.I got 3 spare tp600 mainboards(all password protected)but atleast i can see if the mainboard boots to error codes atleast,surely thats better as you said than destroying a few mainboards,obviously easier said than done. 
