SBE questions

[amontillado]

I have a couple of questions some which are mentioned more often but i couldn't find a suitable solution.

What I want.
- Stutter free livetv / timeshifting
- ffwd/rew (or skip) in livetv / timeshifting.
As you can see, basically what everybody else wants.

This is what I can get gbpvr to do at the moment
1) - Not using Sbe
Perfect stutter free livetv / timeshift  (it really plays wonderfull, only some slight stuttering when the osd/mini guide is visible,  but that is no problem).
But no ffdw/rew (this is a known isue of course)

or:
2) - Using Sbe
Perfectly working ffwd/rew
But unfortunalty lots of micro stutters,  regardless of the decoders used, or how far i'm behind livetv.
The microstuttering occurs randomly but quite frequently (couple of stutters every minute).

What I tried
- Other harddisk partion (livetv/pause buffer is now on a completly empty udma drive)
- Different decoders and audio/video renderers.
- Different pvr cards (i have a 250 (ivac 15), 250 (ivac 16) and 350 available for testing.
- Installed pvr is a second pc,  same problem.

Questions
- Is there some sbe buffer that can be increased (i noticed an sbe buffer value in a myhtpc registry key,but couldn't find one for gbpvr).... or wouldn't that help anyway ?
- I read that the problem whith ffwd/rew without sbe is partially because of the standard mpeg splitter, wouldn't it be possible to select the mpeg splitter just like the decoders ? For example, the opensource mpeg splitter (by gabest), i have zoomplayer setup to use this splitter and it works perfectly,  with this you can ffwd up to 48x speed (it can also do this with files that are still being recorded).  
- But this also makes me wondering, am I correct in asuming that when not using SBE, gbpvr uses for the playback part the same directshow graph in livetv aswell as playback of recorded files ?
If so, wouldn't ffwd/rew be possible, at least for the ones not using the 350 hardware decoder ?

Considering the fact that ffwd/rew without sbe is probably more difficult, the most likely solution for me would be to solve the microstuttering whenn using sbe... does anybody have any other suggestions for this.

Notes
I know that the subject of ffwd/rew is covered in lost and lost of other topics, and i don't want to seem ungratefull since i think sub has done / is doing a great job.
But I still hope there a solution can be found for this, since gbpvr has so many great capabilities, but this problem is just driving me crazy.

Greetz,

Ger