Najabat,
Don't stop at the very bottom, continue a bit past 6 o'clock on every run.
By overlapping each run on the bottom you will build up a bit more metal without having to try and stack it.
On the cap when you get to 6 o'clock go about 1" past then come back over that 1" then head back forward again to complete.
There is a real art to tieing in the bottoms so play around until you find what you are comfortable with.
Good luck,
Shane