before i start off i would like to say that i've been lurking these forums since about the beginning of the year and would like to say that this is a great community. so far i've been able to utilize the search and just dive through threads to find the info i needed, or at least enough to point me in the right direction and for that i already owe the community a thanks!
now on to my current concern.... i've done a couple extract brews and through the last few months have been acquiring stuff to further my brewing experience. for a steal of a deal i picked up 2 rubbermaid 5 gallon coolers. one of which i now know is a HLT and the other a mash tun. they have the false bottom and nice ball valves and everything on them, so they are good to go, now i'm trying to see if i am. from years of drinking beer, i've figured out that i like the higher gravity stuff, and so that what i'm hoping to brew. i've done a bit of research and from what http://www.rackers.org/calcs.shtml has told me, if i use a 1:1 water/grain i can use these for up like 14-ish pounds of grain.
sorry for the wall of text and on to the direct questions...
1) what, if any, are the downfalls of using a 1:1 ratio?
2) will i get a descent boil size with this method? (shooting for 5 gallon batches BTW)
also, sorry for the lack of regular caps, my shift key is finicky. hoping for the ability to produce 1075-ish beers. thanks in advance for any advice/pointers or anything productive.