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I put $5000 in the requested box, I can't remember if it was the total requested CLI or the new limit. Honestly I thought it would just get rejected so wasn't really paying attention :-)
If I remember correctly the box is for how much more you want, which would certainly make sense in your case. I've always wondered if you should just be conservative in the ask or go for broke and see how they counter...
I already got the HP so I just thought I would go for broke and maybe they would counter. I wasn't expecting to get the whole $5k so was very happy, and there was no second HP.