Toilets made in 1992 and newer have to conserve water and can use only 1.6-gal/flush.
For a better flush you can get the pre-1992, ye olde 3.2-gal/flush toilet, down at
www.spearsbrothers.com/contact-us-1/ in Belmont, on RT 106 just south of the Laconia line ..... for about $25.
www.youtube.com/watch?v=XGChTEfeeC4 ...... President Trump opinion on low flow toilets ..... December 7, 2019 .... wanted to return to the 3.2 gal, pre-1992 toilets ..... back when toilets gave a good strong flush .... needing to flush ten to fifteen times never used to happen.