You will be good to go with that setup…
You can easily run 8*7135 on an XM-L, but at 2800mA it will get pretty hot pretty fast
This link should help you out
http://flashlightwiki.com/DIY_P60
Expect that XM-L2 at 1500-1750mA to hit around 700-800 lumens
http://flashlightwiki.com/Cree#XM-L2
Another great thread you should visit