Uranus and Neptune Responsible For Solar Grand Minima and Solar Cycle Modulation?

Solar system dynamics have been postulated as the main solar driver for
many decades. Paul D. Jose (1965) was the first to associate a recurring
solar system pattern of the 4 outer planets (179 years). Jose suggested
this pattern correlates with the modulation of the solar cycle. New
research via this study suggests that over the past 6000 years the 179
year cycle cannot be maintained and is closer to a 172 year cycle which
aligns with the synodic period of Uranus & Neptune (171.44 years).

Geoff J. Sharp (2013) - Detailed solar Angular Momentum (AM) graphs produced from the Jet Propulsion Laboratory (JPL) DE405 ephemeris display cyclic perturbations that show a very strong correlation with prior solar activity slowdowns. These same AM perturbations also occur simultaneously with known solar path changes about the Solar System Barycentre. The AM perturbations can be measured and quantified allowing analysis of past solar cycle modulations along with the 11,500 year solar proxy records (14C & 10Be). 
The detailed AM information also displays a recurring wave of modulation that aligns very closely with the observed sunspot record since 1650. The AM perturbation and modulation is a direct product of the outer gas giants (Uranus and Neptune). This information gives the opportunity to predict future grand minima along with normal solar cycle strength with some confidence. A proposed mechanical link between solar activity and planetary influence via a discrepancy found in solar/planet AM along with current AM perturbations indicate solar cycle 24 & 25 will be heavily reduced in sunspot activity resembling a similar pattern to solar cycles 5 & 6 during the Dalton Minimum (1790-1830; see also HERE).

The path of the Sun shows the two distinct loops around the
Solar System Barycentre (centre point).

Typical planet positions demonstrating strong Types A & B perturbations.
The Type A example is taken from near the centre of the Sporer Minimum
(1472). Type B events coinciding with less reduction of solar activity
compared with Type A events of similar angle (reverse).