The basic theory on how Neptune & Uranus control Solar Grand Minima and Solar Cycle Modulation is as follows: Shown in Carl's graph is a wave modulation mainly created by Jupiter & Saturn together (top of wave)and Jupiter & Saturn opposing (bottom of wave) which effectively is the momentum engine of the Sun, the top of the wave is strong, the bottom is weak (weaker means stronger cycle).
Every 179 yrs Neptune & Uranus gather behind Jupiter (the largest gravity source besides the Sun) giving it extra momentum force and IF Saturn is on the other side of the Sun, the "down" cycle is shortened and not as weak because of the reduced momentum to Saturn...coincides every time with less sunspot activity for the last 1000 yrs at least.
The interesting features in particular is the camel shaped humps (green & red arrows) that occur every time during Grand Minima and more recently (967, 1005, 1290, 1470, 1650, 1790, 1830, 1970 & 2010).
Researching the planetary positions I found a recurring pattern, it seems that Neptune and Uranus aligning with Jupiter and Saturn opposing (doesn't have to be in perfect alignment) creates a disturbance which changes the regular pattern.
The sunspot cycle modulation follows that control or momentum curve as shown in a graph later in the report.
I believe we can now confidently predict Solar Grand Minima and Solar Cycle Modulation strength.
There are 3 phases to consider but only if the angles of J S are favorable as N U start to come together( and I am just discovering that it doesnt happen often, 1280 to now is truly a golden period), basically we have a strong lead up of solar peaks before grand minima event then if the partial line up (1st phase) is strong enough we have grand minima like we did for the Dalton, Maunder, Sporer and maybe Wolf.
This disturbance coincides with the Dalton, Maunder, Sporer and Wolf and Oort minimums.
In the past we had a build up of solar cycle strength immediately before Grand Minima which is due to the extra momentum in the system from N U.
This could also dramatically slow down the production of sunspots. The planetary lineup of that period is very similar to today and their revised sunspot group SC4 could mirror SC24.
As can be seen from the graph below with normal fluctuations and a low solar pole strength that would certainly be possible. The chart below kindly supplied by Carl shows angular momentum from 995 - 2895.