Hello

I recently bought my Ibanez GRG150DXB and it was going great this was until i needed to change the strings. This is the first time I've changed the strings on this guitar but have done it countless times before on my previous guitar. However when tuning the strings the Tremolo bridge rises up and by the time I've tuned the high e string the low E, A and D strings have gone out of tune because of the rising the the tremolo bridge. I have tried tightening the screws in the back to prevent this however this has had little effect. I am using Ernie Ball Beefy Slinky's with a gauge of 11 15 22p 30 42 54 for using in dropped D and Dropped C tuning. Any help would be great and I would like to thank you in advance. Any questions that will help you to help me are much appreciated.

Thanks