If you're stuck at review you aren't seeing 10x development, you're seeing 10x code generation.
This is especially important because without the review/test/deploy part of the pipeline you aren't actually seeing any progress towards business goals.
Once you do get these parts sorted, you can then look at what multiplier you're seeing.
That's not to say there isn't an improvement in your workflow, just that you can't say with any certainty what kind of improvement without measuring the end to end.
It might turn out that the rest of the pipeline is way easier , in which case your multiplier will be higher, it might also be much harder, in which case the multiplier will be lower.
I'm not taking shots, i mean it seriously, especially if you need to report any of this to the rest of the business.
edit : In addition, if it turns out that review is going to be a bottleneck you can get extra resource pointed in that direction which will benefit the workflow overall.
another edit: i would consider correctly managing the expectations of those you report to as a vital skill.
do you have a link to the breakdown by division ?
I can see general statements but nothing with breakdowns.