Spell improve Stats / stacking States

[lpz_Nq]

Hi there and greets from Germany! 
First I wan't to say, that you all are doing a very good job here!
I found so many awesome scripts here - so keep doing!

I'm one of these guys which used the 2k and 2k3 and is now missing some things in the VX.
For Example a Spell which improves the Defence per usage. The "State" DEF UP does it only once!
So I used a script ( Yanfly Engine RD - Custom Status Properties [I don't know if I may Link it] ) which lets me stack the States. Its not very easy to use it and it seems it doesnt Work perfect - when I use it the second time in a Battle, it doesn't say "x's defense is increased!". I also tried to use the "apply effect"-function, but it didn't help.
So my request: Has someone a nice solution for my problem?

Best Regards