Slow motion (constant speed) rendering problem. ATTENTION PROs!

I have tried almost everything to try and fix my problem and now I am going insane!
I am editing a short promo featuring constant speed adjustments and video filters. When I render the video seems to drop frames and jutter. Why is this when i have only reduced the speed of the clips by 50% or 75% ? ?
I have put it through compressor several times and printed the video onto DVD to see if the problem lies within any other program, but i believe my problem is with final Cut HD.
The footage is HDV interlaced. I have made sure the frame blending options are checked although this makes no difference and have rendered it I dont know how many time.
Do I need to bring the original rushes out of the bin and adjust the speed again from scratch...essentially start again?
HELP! I am going mad!
Mac Book Pro (2ghz intel / 2gb memory) Mac OS X (10.4.9) Final Cut Studio HD

I have done it!
I firstly made a quicktime movie, using current settings, to create a single HDV clip. I then created a new sequence, titled HDV, and opened up the sequence settings. Going into the video processing tab I changed field dominance to 'upper odd' and motion to 'best'. I then dropped the new HDV clip into the timeline. At this point I sent this new clip to Compressor and chose the 'best quality 90min 16/9', MPEG 2 two pass + Dolby. EXPORT....HAPPY DAYS! The results are great. Perhaps I could make it better by stopping the footage down to SD first?

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