How can I fix Raycasting FindPartOnRay Delays? (Please help!)

So, I am trying to create an attack where a user lauches a projectile forward, and the projectile should stop/break whenever it comes in contact with anther brick. For this, I have been utilizing raycasting (as the projectile "moves" via changing its CFrame).

For whatever reason, the part of my code that detects obstacles only seems to work well with small obstacles (like short, thin walls) rather than what most of my game is built with (larger, thicker blocks of earth). Is there a reason for this? It seems like a runtime error more than a logic error, but I'm open to suggestions (as I'm fairly new to this).

Here is the part of my code that detects obstacles. You can ignore most of the lines that don't pertain to actual raycasting.

	for i = 0, 75, 1 do -- Moves the projectile forward.
		wait()
		if sensor.Name ~= 'DeadTornadoToss_' .. player.Name then
			tornado:SetPrimaryPartCFrame(tornado:GetPrimaryPartCFrame() - tornado:GetPrimaryPartCFrame().LookVector * 1.5)
			ray = Ray.new(sensor.CFrame.p - sensor.CFrame.LookVector * 5, sensor.CFrame.LookVector) -- origin, direction
			ray2 = Ray.new(sensor.CFrame.p - sensor.CFrame.LookVector * 5 + sensor.CFrame.RightVector * 3, sensor.CFrame.LookVector) -- origin, direction
			ray3 = Ray.new(sensor.CFrame.p - sensor.CFrame.LookVector * 5 - sensor.CFrame.RightVector * 3, sensor.CFrame.LookVector) -- origin, direction
		end
		local part, hitPosition = workspace:FindPartOnRay(ray)
		local part2, hitPosition2 = workspace:FindPartOnRay(ray2)
		local part3, hitPosition3 = workspace:FindPartOnRay(ray3)
		if part or part2 or part3 then
			if part then
				obstacle = part:FindFirstAncestorOfClass("Model")
			else if part2 then
				obstacle = part2:FindFirstAncestorOfClass("Model")
			else if part3 then
				obstacle = part3:FindFirstAncestorOfClass("Model")
			end
			end
			end
			if obstacle ~= nil then
				if obstacle:FindFirstChild("Humanoid") == nil then
					print("Hit part")
					sensor.Name = 'DeadTornadoToss_' .. player.Name
					tornado.SmallTornado.Transparency = 1
					break
				end
			else
				print("Hit part")
				sensor.Name = 'DeadTornadoToss_' .. player.Name
				tornado.SmallTornado.Transparency = 1
				break	
			end
		end
	end