Hi Pino!
Well if your in Canada then, Ed Craig is someone that you might be familiar with am I correct?
Check out his website in case you have not...
http://www.weldreality.com
I do not know if he still takes questions via e-mail but, he did the last time I checked. He's a GMAW/FCAW/MCAW process expert that is in my opinion FWIW, is invaluable for anyone involved with the above mentioned processes...
Oh yeah I almost forgot, Is the silicon content of the W44 the same as in A36 as far as percentages go and, what brand of wire are you using? What thickness/structural shape is the material?
Silicon is used in MIG welding wire primariliy as deoxidizing agent along with other elements as you already know and yet, with Flux core wire, you do'nt have all of these issues to address as JW has mentioned before so, if I were you, I'd look into flux core as an alternative to your current process application...
Respectfully,
SSBN727 Run Silent... Run Deep!!!