Hi hun tbh, ur tip is just ur canvas to sculpt ontop, it is not for strength. Weather I do all pink or clear or pink and white either on as tip or on a form I will sculpt in zones either with 2 zones or 3. Zone 1 being your freeedge so your white when doingP&W then zone 2 then 3 by your eponychium.
I self taught myself sculpting on a form an tbh it takes hrs and hrs of practise, I was taught to sculpt on a tip and just went home and got my forms out and went right,,,,,, and practised,,,and practised,, done free sets fo friends and family. \I found at first I place a bead on my form and make myseld a thin layer which resembles where my tip would be, then another bead and just imagine it was a tip. But you have to build a little thicker not much., and also watch your side walls, and make sure your form is placed correctly,,,,,, ohhhh dont know how long I spent troubleshooting,,and I am by no means experienced. I am doing some 1-1 with cnd to ensure my little habits are not bad ones,,iygwim.
HTH xxx