I've had lightweight MPI thumbholes and while the quality sucked ass,the felt recoil reductions were readily apparent,despite the weight reduction.
Have had numerous laminates,up to 7mmRemmie Mag and the trend is lineal.
With a T-hole,one simply has more surface area affixed the stock proper,to fend recoil with. A simplistic principle,that bears fruit.
Cloward makes a dandy....................