SIMPLE setup
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if you have 19's--do this....leave the t4m0 alone with the stock MAF
If you have 24's--do this...download the j4j1 bin file off the tweecerwebsite or yahoo, ect. Transfer your tm40 (also the wxxx file is the same MAF transfer) to the j4j1. It will work with the j4j1 MAF transfer but most get better results out of the t4m0 transfer.
IF you are 100% sure you have 24's, and want to get more in depth
j4j1 bin file, load your t4m0 MAF transfer, to get a base inj. slope enter 24 for the high sloe then multiply 24 x 1.2 for the low slope, Change the breakpoint to that of the t4m0. For a starging point.
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Now from what your posting...it sounds like your...well I dont know anymore...like your running a 19lb setup in the tune while you have a 24lb inj.??
To clearify...
1. The MAF is not controling the inj. as far as what size The slopes and breakpoint control the inj. size. The MAF is a sensor that tells the eec how much AIR MASS is coming into the motor. The eec calc. what it needs to do based on what it is given (your inputs into the tweecer). Everything works togther.
2. Forget about what people say about C&L/Pro M about the MAF being cald' for an injector...as stated before ALL there cals' are setup to "FOOL" the eec to work without any other interface with the eec. A proper MAF transfer is all that is needed out of the MAF itself.
With 24's and a stock MAF it realy is not that hard to get things down right...
listing EXactly every change your making in the tweecer might help us fig what your doing.