My recommendations for great PHs for your desired game the Buffalo and Hippo "up close".
Stu Taylor or Johnnie Johnson of www.kambakosafaris.com in Northern Mozambique (Niassa Reserve).
Jonnathon Taylor of "ABC" www.africanbushcompany.com of Tanzania (Selous Reserve).
Lindon Stanton of www.mbalablasafaris.com for Zimbabwe (Zambezi Valley).
Allan Shearing of Charlton McCallum Safaris for Zimbabwe (Zambezi Valley).
Derk Mossert of www.chifutisafaris.com for Zimbabwe (Zambezi Valley).
Andy Hunter Zimbabwe (Zambezi Valley).