G limits
Hi Nigd3,
The US Navy's Blue Angels carry out all their display manoeuvers without the benefit of G suit protection, however they are all relatively young and highly fit naval aviators and it's a strain even for them!
If you really need to go to +7 then you should be looking to think about the following as a minimum:
Age and fitness of the pilot - a standard medical doesn't cover nearly enough of the requirements for high G flight (for instance high blood pressure in this case is actually a good thing)
Previous experience with high G manoeuvers
And the big ones.... rate of G onset and duration - if the G comes on fast then GLOC is almost certain unless you're very good at G straining techniques, likewise the longer the duration the more likelihood of GLOC.
I'd seriously consider getting the anti-G system working and putting on your speed jeans. Even then you'll only get about another 1.5 to 2 G's worth of protection with the system active.