What is the best regress basis of slow_event related design

Hi~
Thanks for your suggestion! In fact, I'm only acquired the data from one subject right now and would like to do some preprocessing steps first. Your suggestion will be carefully considered, thank you very much!
Now we are using TENT(0,14,7) as regress basis and there is no error reported about collinearity problem, but it prompts as follows
Number of time points: 1432(before censor); 1418 (after)
Number of parameters: 1816 [80 baseline ; 1736 signal]
ERROR: Regression model has too many parameters for dataset length :
FATAL ERRoR: 3dDeconvolve dies: Insufficient data (1418)for estimating 1816 parameters