Ok, so the thing is that your minfree settings are one part, the other part is what we call the oom adj values, out of memory adjustment parameters.
Tinkering with those can get dicey, especially if changing init scripts without full knowledge of the boot sequence and the implications of memory adjustments.
I worked extensively with V6 SuperCharger - great tool - especially if you know what it's really doing.
At this point, on my phone with 680 MB user ram, I have found a simpler solution that serves me very well, please note that the specifics here are for an HTC phone, not yours, but this can give you the mechanics to develop your own strategy -
Note that you can test first before committing it to override your setup as a post boot process.
Here is the meaning of what you are adjusting -
http://www.androidcentral.com/fine-tuning-minfree-settings-improving-androids-multi-tasking
But try the more modern tool that I recommend, ROM Toolkit is another great one (but maybe a little more complicated for the same thing - anyway, you decide on that).
Don't know if this has already been discussed, apologies if so, otherwise, hope this helps.