They had begun the campaign with wins over Trinity Accies and Edinburgh Northern, but really hit top form on Saturday as visitors Leith were put to the sword 72-10.
Brodie led the way with his trio with Forrester taking control after the game was tied at 10-10 early on.
Dalkeith top the division though and they too have won three from three.
The Midlothian men have scored 148 points in those three wins after they went to Earlston and came out on top 52-8 on Saturday.
Penicuik are in fourth place after they edged out Trinity Accies 27-23, but Lismore are in second bottom spot after they lost 68-0 at Berwick.
Preston Lodge and RHC Cougars remain unbeaten at the top of RBS East One.
The East Lothian side, who are in top spot, came back from Langholm with a 55-9 win under their belts while the Cougars kept a clean sheet as they defeated Hawick Linden 39-0.
Dunbar are third after posting a 55-3 win at Cavalry Park against Portobello with North Berwick also getting a good away win, 36-16 at Hawick Harlequins. Linlithgow defeated Duns 55-5 and they sit fourth. Broughton beat Walkerburn 59-0 at Wardie and have won two from two in RBS East Three.
Ross High defeated Queensferry 15-12 while St Boswells are out on top.