sand blast cabinet update help please

i bought it in 1994 from the cornwell tool man. i have been thru 2 vacuum motors, 3 guns, numerous nozzles. it appears that is the same as the 960 on tp tools web site. 28 in deep, 46 in long, door on rt side. i have tried using low pressure(30-45), high pressure(60-75) low media level, med and high media level. i added a 2nd light on the rt side. upgraded the supply line to 3/8 id, 2 dryers( 1 at the compressor and another at the cabinet.) back in 1994 the cabinet was 1300.00 now it is 1800.00 on tp tools plus shipping. the cabinet is in great shape. i moved the vacuum cleaner hole to a different area of the cabinet. i have looked at the tacoma co/harbor freight mods as well as other ones on you tube. i think that removing the siphon tube and adding the mixer valve into the drain box will help. i am trying to decide between the tacoma co kit( approx 800.00) or the partswaherupgradekit (approx 325.00)