In my opinion the PVP hotspots should be kept as is and not be made huge. Maybe condense the Homeworld system into one large planet instead of having five different planets but leave Arma and GG as is. Increasing planet size here would only lead to planetary PVP coming to a halt.
At this point smaller factions can still farm on these planets without getting caught all the time. These are PVP hotspots, you are meant to have a tough fight for your stuff there and not just farm in peace. Farming on GG should be earned, not be a given for anyone that happens to land there.